Revert r 144499 "Rename the remaining usage of Monitor to Display"

Temporarily reverting rename change to investigate 133784

TBR=oshima@chromium.org
BUG=123160
TEST=none

Review URL: https://chromiumcodereview.appspot.com/10689014

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@144573 0039d316-1c4b-4281-b951-d872f2087c98

64 files changed, 552 insertions, 550 deletions

diff --git a/ash/accelerators/accelerator_controller.cc b/ash/accelerators/accelerator_controller.cc
index 29380da..287bcec 100644
--- a/ash/accelerators/accelerator_controller.cc
+++ b/ash/accelerators/accelerator_controller.cc
@@ -16,8 +16,8 @@
 #include "ash/launcher/launcher_delegate.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/magnifier/magnification_controller.h"
-#include "ash/display/display_controller.h"
-#include "ash/display/multi_display_manager.h"
+#include "ash/monitor/monitor_controller.h"
+#include "ash/monitor/multi_monitor_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/screenshot_delegate.h"
 #include "ash/shell.h"
@@ -44,7 +44,7 @@
 #include "ui/oak/oak.h"
 
 #if defined(OS_CHROMEOS)
-#include "chromeos/display/output_configurator.h"
+#include "chromeos/monitor/output_configurator.h"
 #endif  // defined(OS_CHROMEOS)
 
 namespace ash {
@@ -585,17 +585,17 @@ bool AcceleratorController::PerformAction(int action,
       return HandleToggleDesktopBackgroundMode();
     case TOGGLE_ROOT_WINDOW_FULL_SCREEN:
       return HandleToggleRootWindowFullScreen();
-    case DISPLAY_ADD_REMOVE:
+    case MONITOR_ADD_REMOVE:
       if (DebugShortcutsEnabled())
-        internal::MultiDisplayManager::AddRemoveDisplay();
+        internal::MultiMonitorManager::AddRemoveMonitor();
       return true;
-    case DISPLAY_CYCLE:
+    case MONITOR_CYCLE:
       if (DebugShortcutsEnabled())
-        internal::MultiDisplayManager::CycleDisplay();
+        internal::MultiMonitorManager::CycleMonitor();
       return true;
-    case DISPLAY_TOGGLE_SCALE:
+    case MONITOR_TOGGLE_SCALE:
       if (DebugShortcutsEnabled())
-        internal::MultiDisplayManager::ToggleDisplayScale();
+        internal::MultiMonitorManager::ToggleMonitorScale();
       return true;
     case MAGNIFY_SCREEN_ZOOM_IN:
       return HandleMagnifyScreen(1);
diff --git a/ash/accelerators/accelerator_table.cc b/ash/accelerators/accelerator_table.cc
index ba89019..3c40f73 100644
--- a/ash/accelerators/accelerator_table.cc
+++ b/ash/accelerators/accelerator_table.cc
@@ -123,10 +123,10 @@ const AcceleratorData kAcceleratorData[] = {
   // For testing on systems where Alt-Tab is already mapped.
   { true, ui::VKEY_W, ui::EF_ALT_DOWN, CYCLE_FORWARD_MRU },
   { true, ui::VKEY_W, ui::EF_SHIFT_DOWN | ui::EF_ALT_DOWN, CYCLE_BACKWARD_MRU },
-  { true, ui::VKEY_F4, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, DISPLAY_CYCLE },
-  { true, ui::VKEY_F4, ui::EF_SHIFT_DOWN, DISPLAY_ADD_REMOVE },
+  { true, ui::VKEY_F4, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN, MONITOR_CYCLE },
+  { true, ui::VKEY_F4, ui::EF_SHIFT_DOWN, MONITOR_ADD_REMOVE },
   { true, ui::VKEY_HOME, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN,
-    DISPLAY_TOGGLE_SCALE },
+    MONITOR_TOGGLE_SCALE },
 #if !defined(NDEBUG)
   { true, ui::VKEY_L, ui::EF_SHIFT_DOWN | ui::EF_CONTROL_DOWN | ui::EF_ALT_DOWN,
     PRINT_LAYER_HIERARCHY },
diff --git a/ash/accelerators/accelerator_table.h b/ash/accelerators/accelerator_table.h
index 788de46..23961b5 100644
--- a/ash/accelerators/accelerator_table.h
+++ b/ash/accelerators/accelerator_table.h
@@ -67,9 +67,9 @@ enum AcceleratorAction {
   OPEN_FILE_MANAGER_DIALOG,
   OPEN_FILE_MANAGER_TAB,
 #endif
-  DISPLAY_ADD_REMOVE,
-  DISPLAY_CYCLE,
-  DISPLAY_TOGGLE_SCALE,
+  MONITOR_ADD_REMOVE,
+  MONITOR_CYCLE,
+  MONITOR_TOGGLE_SCALE,
   ROTATE_SCREEN,
   TOGGLE_DESKTOP_BACKGROUND_MODE,
   TOGGLE_ROOT_WINDOW_FULL_SCREEN,
diff --git a/ash/ash.gyp b/ash/ash.gyp
index 65537af..857581d 100644
--- a/ash/ash.gyp
+++ b/ash/ash.gyp
@@ -97,14 +97,14 @@
         'launcher/tabbed_launcher_button.h',
         'magnifier/magnification_controller.cc',
         'magnifier/magnification_controller.h',
-        'display/display_controller.cc',
-        'display/display_controller.h',
-        'display/mouse_cursor_event_filter.cc',
-        'display/mouse_cursor_event_filter.h',
-        'display/multi_display_manager.cc',
-        'display/multi_display_manager.h',
-        'display/secondary_display_view.cc',
-        'display/secondary_display_view.h',
+        'monitor/monitor_controller.cc',
+        'monitor/monitor_controller.h',
+        'monitor/mouse_cursor_event_filter.cc',
+        'monitor/mouse_cursor_event_filter.h',
+        'monitor/multi_monitor_manager.cc',
+        'monitor/multi_monitor_manager.h',
+        'monitor/secondary_monitor_view.cc',
+        'monitor/secondary_monitor_view.h',
         'root_window_controller.cc',
         'root_window_controller.h',
         'screen_ash.cc',
@@ -379,7 +379,6 @@
         'accelerators/accelerator_table_unittest.cc',
         'accelerators/nested_dispatcher_controller_unittest.cc',
         'dip_unittest.cc',
-        'display/multi_display_manager_unittest.cc',
         'drag_drop/drag_drop_controller_unittest.cc',
         'extended_desktop_unittest.cc',
         'focus_cycler_unittest.cc',
@@ -388,6 +387,7 @@
         'launcher/launcher_navigator_unittest.cc',
         'launcher/launcher_unittest.cc',
         'launcher/launcher_view_unittest.cc',
+        'monitor/multi_monitor_manager_unittest.cc',
         'root_window_controller_unittest.cc',
         'screensaver/screensaver_view_unittest.cc',
         'shell_unittest.cc',
diff --git a/ash/dip_unittest.cc b/ash/dip_unittest.cc
index b710e4c..a6ebe14 100644
--- a/ash/dip_unittest.cc
+++ b/ash/dip_unittest.cc
@@ -28,7 +28,7 @@ namespace ash {
 typedef ash::test::AshTestBase DIPTest;
 
 #if defined(OS_WIN)
-// Windows/Aura doesn't have DIP support in display yet.
+// Windows/Aura doesn't have DIP support in monitor yet.
 #define MAYBE_WorkArea DISABLED_WorkArea
 #else
 #define MAYBE_WorkArea WorkArea
@@ -36,7 +36,7 @@ typedef ash::test::AshTestBase DIPTest;
 
 // Test if the WM sets correct work area under different density.
 TEST_F(DIPTest, MAYBE_WorkArea) {
-  ChangeDisplayConfig(1.0f, gfx::Rect(0, 0, 1000, 900));
+  ChangeMonitorConfig(1.0f, gfx::Rect(0, 0, 1000, 900));
 
   aura::RootWindow* root = Shell::GetPrimaryRootWindow();
   const gfx::Display display = gfx::Screen::GetDisplayNearestWindow(root);
@@ -46,7 +46,7 @@ TEST_F(DIPTest, MAYBE_WorkArea) {
   EXPECT_EQ("0,0 1000x852", work_area.ToString());
   EXPECT_EQ("0,0,48,0", display.bounds().InsetsFrom(work_area).ToString());
 
-  ChangeDisplayConfig(2.0f, gfx::Rect(0, 0, 2000, 1800));
+  ChangeMonitorConfig(2.0f, gfx::Rect(0, 0, 2000, 1800));
 
   const gfx::Display display_2x = gfx::Screen::GetDisplayNearestWindow(root);
 
diff --git a/ash/extended_desktop_unittest.cc b/ash/extended_desktop_unittest.cc
index 9a70acc..8469eb5 100644
--- a/ash/extended_desktop_unittest.cc
+++ b/ash/extended_desktop_unittest.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/display/display_controller.h"
-#include "ash/display/multi_display_manager.h"
+#include "ash/monitor/monitor_controller.h"
+#include "ash/monitor/multi_monitor_manager.h"
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
 #include "ash/wm/window_cycle_controller.h"
@@ -58,19 +58,19 @@ class ExtendedDesktopTest : public test::AshTestBase {
   virtual ~ExtendedDesktopTest() {}
 
   virtual void SetUp() OVERRIDE {
-    internal::DisplayController::SetExtendedDesktopEnabled(true);
+    internal::MonitorController::SetExtendedDesktopEnabled(true);
     AshTestBase::SetUp();
   }
 
   virtual void TearDown() OVERRIDE {
     AshTestBase::TearDown();
-    internal::DisplayController::SetExtendedDesktopEnabled(false);
+    internal::MonitorController::SetExtendedDesktopEnabled(false);
   }
 
  protected:
-  internal::MultiDisplayManager* display_manager() {
-    return static_cast<internal::MultiDisplayManager*>(
-        aura::Env::GetInstance()->display_manager());
+  internal::MultiMonitorManager* monitor_manager() {
+    return static_cast<internal::MultiMonitorManager*>(
+        aura::Env::GetInstance()->monitor_manager());
   }
 
  private:
@@ -80,7 +80,7 @@ class ExtendedDesktopTest : public test::AshTestBase {
 // Test conditions that root windows in extended desktop mode
 // must satisfy.
 TEST_F(ExtendedDesktopTest, Basic) {
-  UpdateDisplay("0+0-1000x600,1001+0-600x400");
+  UpdateMonitor("0+0-1000x600,1001+0-600x400");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
 
   // All root windows must have the root window controller.
@@ -99,7 +99,7 @@ TEST_F(ExtendedDesktopTest, Basic) {
 }
 
 TEST_F(ExtendedDesktopTest, Activation) {
-  UpdateDisplay("0+0-1000x600,1001+0-600x400");
+  UpdateMonitor("0+0-1000x600,1001+0-600x400");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
 
   // Move the active root window to the secondary.
@@ -134,7 +134,7 @@ TEST_F(ExtendedDesktopTest, Activation) {
 }
 
 TEST_F(ExtendedDesktopTest, SystemModal) {
-  UpdateDisplay("0+0-1000x600,1001+0-600x400");
+  UpdateMonitor("0+0-1000x600,1001+0-600x400");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   Shell::GetInstance()->set_active_root_window(root_windows[0]);
 
@@ -153,7 +153,7 @@ TEST_F(ExtendedDesktopTest, SystemModal) {
   EXPECT_EQ(root_windows[1], modal_widget->GetNativeView()->GetRootWindow());
   EXPECT_EQ(root_windows[1], Shell::GetActiveRootWindow());
 
-  // Clicking a widget on widget_on_1st display should not change activation.
+  // Clicking a widget on widget_on_1st monitor should not change activation.
   aura::test::EventGenerator generator_1st(root_windows[0]);
   generator_1st.MoveMouseToCenterOf(widget_on_1st->GetNativeView());
   generator_1st.ClickLeftButton();
@@ -169,7 +169,7 @@ TEST_F(ExtendedDesktopTest, SystemModal) {
 }
 
 TEST_F(ExtendedDesktopTest, TestCursor) {
-  UpdateDisplay("0+0-1000x600,1001+0-600x400");
+  UpdateMonitor("0+0-1000x600,1001+0-600x400");
   Shell::GetInstance()->ShowCursor(false);
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   EXPECT_FALSE(root_windows[0]->cursor_shown());
@@ -186,8 +186,8 @@ TEST_F(ExtendedDesktopTest, TestCursor) {
 }
 
 TEST_F(ExtendedDesktopTest, CycleWindows) {
-  internal::DisplayController::SetVirtualScreenCoordinatesEnabled(true);
-  UpdateDisplay("0+0-700x500,0+0-500x500");
+  internal::MonitorController::SetVirtualScreenCoordinatesEnabled(true);
+  UpdateMonitor("0+0-700x500,0+0-500x500");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   // Emulate virtual screen coordinate system.
   root_windows[0]->SetBounds(gfx::Rect(0, 0, 700, 500));
@@ -235,12 +235,12 @@ TEST_F(ExtendedDesktopTest, CycleWindows) {
   EXPECT_TRUE(wm::IsActiveWindow(d2_w1->GetNativeView()));
   controller->HandleCycleWindow(WindowCycleController::BACKWARD, true);
   EXPECT_TRUE(wm::IsActiveWindow(d2_w2->GetNativeView()));
-  internal::DisplayController::SetVirtualScreenCoordinatesEnabled(false);
+  internal::MonitorController::SetVirtualScreenCoordinatesEnabled(false);
 }
 
 TEST_F(ExtendedDesktopTest, GetRootWindowAt) {
-  internal::DisplayController::SetVirtualScreenCoordinatesEnabled(true);
-  UpdateDisplay("0+0-700x500,0+0-500x500");
+  internal::MonitorController::SetVirtualScreenCoordinatesEnabled(true);
+  UpdateMonitor("0+0-700x500,0+0-500x500");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   // Emulate virtual screen coordinate system.
   root_windows[0]->SetBounds(gfx::Rect(500, 0, 700, 500));
@@ -257,12 +257,12 @@ TEST_F(ExtendedDesktopTest, GetRootWindowAt) {
   // Out of range point should return the primary root window
   EXPECT_EQ(root_windows[0], Shell::GetRootWindowAt(gfx::Point(-100, 0)));
   EXPECT_EQ(root_windows[0], Shell::GetRootWindowAt(gfx::Point(1201, 100)));
-  internal::DisplayController::SetVirtualScreenCoordinatesEnabled(false);
+  internal::MonitorController::SetVirtualScreenCoordinatesEnabled(false);
 }
 
 TEST_F(ExtendedDesktopTest, GetRootWindowMatching) {
-  internal::DisplayController::SetVirtualScreenCoordinatesEnabled(true);
-  UpdateDisplay("0+0-700x500,0+0-500x500");
+  internal::MonitorController::SetVirtualScreenCoordinatesEnabled(true);
+  UpdateMonitor("0+0-700x500,0+0-500x500");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   // Emulate virtual screen coordinate system.
   root_windows[0]->SetBounds(gfx::Rect(500, 0, 700, 500));
@@ -297,11 +297,11 @@ TEST_F(ExtendedDesktopTest, GetRootWindowMatching) {
             Shell::GetRootWindowMatching(gfx::Rect(-100, -300, 50, 50)));
   EXPECT_EQ(root_windows[0],
             Shell::GetRootWindowMatching(gfx::Rect(0, 2000, 50, 50)));
-  internal::DisplayController::SetVirtualScreenCoordinatesEnabled(false);
+  internal::MonitorController::SetVirtualScreenCoordinatesEnabled(false);
 }
 
 TEST_F(ExtendedDesktopTest, Capture) {
-  UpdateDisplay("0+0-1000x600,1001+0-600x400");
+  UpdateMonitor("0+0-1000x600,1001+0-600x400");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
 
   aura::test::EventCountDelegate r1_d1;
@@ -353,13 +353,13 @@ namespace internal {
 // Test if the Window::ConvertPointToWindow works across root windows.
 // TODO(oshima): Move multiple display suport and this test to aura.
 TEST_F(ExtendedDesktopTest, ConvertPoint) {
-  UpdateDisplay("0+0-1000x600,1001+0-600x400");
+  UpdateMonitor("0+0-1000x600,1001+0-600x400");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   gfx::Display& display_1 =
-      display_manager()->FindDisplayForRootWindow(root_windows[0]);
+      monitor_manager()->FindDisplayForRootWindow(root_windows[0]);
   EXPECT_EQ("0,0", display_1.bounds().origin().ToString());
   gfx::Display& display_2 =
-      display_manager()->FindDisplayForRootWindow(root_windows[1]);
+      monitor_manager()->FindDisplayForRootWindow(root_windows[1]);
   Shell::GetInstance()->set_active_root_window(root_windows[0]);
   aura::Window* d1 =
       CreateTestWidget(gfx::Rect(10, 10, 100, 100))->GetNativeView();
diff --git a/ash/display/display_controller.cc b/ash/monitor/monitor_controller.cc
index 895532a..b8e1e04 100644
--- a/ash/display/display_controller.cc
+++ b/ash/monitor/monitor_controller.cc
@@ -2,10 +2,10 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/display/display_controller.h"
+#include "ash/monitor/monitor_controller.h"
 
 #include "ash/ash_switches.h"
-#include "ash/display/multi_display_manager.h"
+#include "ash/monitor/multi_monitor_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/shell.h"
 #include "ash/wm/window_util.h"
@@ -26,13 +26,13 @@ bool extended_desktop_enabled = false;
 bool virtual_screen_coordinates_enabled = false;
 }
 
-DisplayController::DisplayController()
+MonitorController::MonitorController()
     : secondary_display_layout_(RIGHT) {
-  aura::Env::GetInstance()->display_manager()->AddObserver(this);
+  aura::Env::GetInstance()->monitor_manager()->AddObserver(this);
 }
 
-DisplayController::~DisplayController() {
-  aura::Env::GetInstance()->display_manager()->RemoveObserver(this);
+MonitorController::~MonitorController() {
+  aura::Env::GetInstance()->monitor_manager()->RemoveObserver(this);
   // Delete all root window controllers, which deletes root window
   // from the last so that the primary root window gets deleted last.
   for (std::map<int, aura::RootWindow*>::const_reverse_iterator it =
@@ -48,31 +48,31 @@ DisplayController::~DisplayController() {
   }
 }
 
-void DisplayController::InitPrimaryDisplay() {
-  aura::DisplayManager* display_manager =
-      aura::Env::GetInstance()->display_manager();
-  const gfx::Display& display = display_manager->GetDisplayAt(0);
+void MonitorController::InitPrimaryDisplay() {
+  aura::MonitorManager* monitor_manager =
+      aura::Env::GetInstance()->monitor_manager();
+  const gfx::Display& display = monitor_manager->GetDisplayAt(0);
   DCHECK_EQ(0, display.id());
   aura::RootWindow* root = AddRootWindowForDisplay(display);
   root->SetHostBounds(display.bounds_in_pixel());
 }
 
-void DisplayController::InitSecondaryDisplays() {
-  aura::DisplayManager* display_manager =
-      aura::Env::GetInstance()->display_manager();
-  for (size_t i = 1; i < display_manager->GetNumDisplays(); ++i) {
-    const gfx::Display& display = display_manager->GetDisplayAt(i);
+void MonitorController::InitSecondaryDisplays() {
+  aura::MonitorManager* monitor_manager =
+      aura::Env::GetInstance()->monitor_manager();
+  for (size_t i = 1; i < monitor_manager->GetNumDisplays(); ++i) {
+    const gfx::Display& display = monitor_manager->GetDisplayAt(i);
     aura::RootWindow* root = AddRootWindowForDisplay(display);
-    Shell::GetInstance()->InitRootWindowForSecondaryDisplay(root);
+    Shell::GetInstance()->InitRootWindowForSecondaryMonitor(root);
   }
 }
 
-aura::RootWindow* DisplayController::GetPrimaryRootWindow() {
+aura::RootWindow* MonitorController::GetPrimaryRootWindow() {
   DCHECK(!root_windows_.empty());
   return root_windows_[0];
 }
 
-void DisplayController::CloseChildWindows() {
+void MonitorController::CloseChildWindows() {
   for (std::map<int, aura::RootWindow*>::const_iterator it =
            root_windows_.begin(); it != root_windows_.end(); ++it) {
     aura::RootWindow* root_window = it->second;
@@ -89,7 +89,7 @@ void DisplayController::CloseChildWindows() {
   }
 }
 
-std::vector<aura::RootWindow*> DisplayController::GetAllRootWindows() {
+std::vector<aura::RootWindow*> MonitorController::GetAllRootWindows() {
   std::vector<aura::RootWindow*> windows;
   for (std::map<int, aura::RootWindow*>::const_iterator it =
            root_windows_.begin(); it != root_windows_.end(); ++it) {
@@ -101,7 +101,7 @@ std::vector<aura::RootWindow*> DisplayController::GetAllRootWindows() {
 }
 
 std::vector<internal::RootWindowController*>
-DisplayController::GetAllRootWindowControllers() {
+MonitorController::GetAllRootWindowControllers() {
   std::vector<internal::RootWindowController*> controllers;
   for (std::map<int, aura::RootWindow*>::const_iterator it =
            root_windows_.begin(); it != root_windows_.end(); ++it) {
@@ -113,12 +113,12 @@ DisplayController::GetAllRootWindowControllers() {
   return controllers;
 }
 
-void DisplayController::SetSecondaryDisplayLayout(
+void MonitorController::SetSecondaryDisplayLayout(
     SecondaryDisplayLayout layout) {
   secondary_display_layout_ = layout;
 }
 
-bool DisplayController::WarpMouseCursorIfNecessary(
+bool MonitorController::WarpMouseCursorIfNecessary(
     aura::Window* current_root,
     const gfx::Point& location_in_root) {
   if (root_windows_.size() < 2)
@@ -189,11 +189,11 @@ bool DisplayController::WarpMouseCursorIfNecessary(
   return false;
 }
 
-void DisplayController::OnDisplayBoundsChanged(const gfx::Display& display) {
+void MonitorController::OnDisplayBoundsChanged(const gfx::Display& display) {
   root_windows_[display.id()]->SetHostBounds(display.bounds_in_pixel());
 }
 
-void DisplayController::OnDisplayAdded(const gfx::Display& display) {
+void MonitorController::OnDisplayAdded(const gfx::Display& display) {
   if (root_windows_.empty()) {
     DCHECK_EQ(0, display.id());
     root_windows_[display.id()] = Shell::GetPrimaryRootWindow();
@@ -201,15 +201,15 @@ void DisplayController::OnDisplayAdded(const gfx::Display& display) {
     return;
   }
   aura::RootWindow* root = AddRootWindowForDisplay(display);
-  Shell::GetInstance()->InitRootWindowForSecondaryDisplay(root);
+  Shell::GetInstance()->InitRootWindowForSecondaryMonitor(root);
 }
 
-void DisplayController::OnDisplayRemoved(const gfx::Display& display) {
+void MonitorController::OnDisplayRemoved(const gfx::Display& display) {
   aura::RootWindow* root = root_windows_[display.id()];
   DCHECK(root);
-  // Primary display should never be removed by DisplayManager.
+  // Primary monitor should never be removed by MonitorManager.
   DCHECK(root != Shell::GetPrimaryRootWindow());
-  // Display for root window will be deleted when the Primary RootWindow
+  // Monitor for root window will be deleted when the Primary RootWindow
   // is deleted by the Shell.
   if (root != Shell::GetPrimaryRootWindow()) {
     root_windows_.erase(display.id());
@@ -225,40 +225,40 @@ void DisplayController::OnDisplayRemoved(const gfx::Display& display) {
 }
 
 // static
-bool DisplayController::IsExtendedDesktopEnabled(){
+bool MonitorController::IsExtendedDesktopEnabled(){
   return extended_desktop_enabled ||
       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kAshExtendedDesktop);
 }
 
 // static
-void DisplayController::SetExtendedDesktopEnabled(bool enabled) {
+void MonitorController::SetExtendedDesktopEnabled(bool enabled) {
   extended_desktop_enabled = enabled;
 }
 
 // static
-bool DisplayController::IsVirtualScreenCoordinatesEnabled() {
+bool MonitorController::IsVirtualScreenCoordinatesEnabled() {
   return virtual_screen_coordinates_enabled ||
       CommandLine::ForCurrentProcess()->HasSwitch(
           switches::kAshVirtualScreenCoordinates);
 }
 
 // static
-void DisplayController::SetVirtualScreenCoordinatesEnabled(bool enabled) {
+void MonitorController::SetVirtualScreenCoordinatesEnabled(bool enabled) {
   virtual_screen_coordinates_enabled = enabled;
 }
 
-aura::RootWindow* DisplayController::AddRootWindowForDisplay(
+aura::RootWindow* MonitorController::AddRootWindowForDisplay(
     const gfx::Display& display) {
-  aura::RootWindow* root = aura::Env::GetInstance()->display_manager()->
-      CreateRootWindowForDisplay(display);
+  aura::RootWindow* root = aura::Env::GetInstance()->monitor_manager()->
+      CreateRootWindowForMonitor(display);
   root_windows_[display.id()] = root;
   // Confine the cursor within the window if
   // 1) Extended desktop is enabled or
-  // 2) the display is primary display and the host window
+  // 2) the display is primary monitor and the host window
   // is set to be fullscreen (this is old behavior).
   if (IsExtendedDesktopEnabled() ||
-      (aura::DisplayManager::use_fullscreen_host_window() &&
+      (aura::MonitorManager::use_fullscreen_host_window() &&
        display.id() == 0)) {
     root->ConfineCursorToWindow();
   }
diff --git a/ash/display/display_controller.h b/ash/monitor/monitor_controller.h
index 1b66d01..72afa42 100644
--- a/ash/display/display_controller.h
+++ b/ash/monitor/monitor_controller.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_DISPLAY_DISPLAY_CONTROLLER_H_
-#define ASH_DISPLAY_DISPLAY_CONTROLLER_H_
+#ifndef ASH_MONITOR_MONITOR_CONTROLLER_H_
+#define ASH_MONITOR_MONITOR_CONTROLLER_H_
 #pragma once
 
 #include <map>
@@ -13,7 +13,7 @@
 #include "base/basictypes.h"
 #include "base/compiler_specific.h"
 #include "ui/aura/display_observer.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 
 namespace aura {
 class Display;
@@ -24,12 +24,12 @@ namespace ash {
 namespace internal {
 class RootWindowController;
 
-// DisplayController owns and maintains RootWindows for each attached
+// MonitorController owns and maintains RootWindows for each attached
 // display, keeping them in sync with display configuration changes.
-// TODO(oshima): Rename DisplayXXX to DisplayXXX.
-class ASH_EXPORT DisplayController : public aura::DisplayObserver {
+// TODO(oshima): Rename MonitorXXX to DisplayXXX.
+class ASH_EXPORT MonitorController : public aura::DisplayObserver {
  public:
-  // Layout options where the secondary display should be positioned.
+  // Layout options where the secondary monitor should be positioned.
   enum SecondaryDisplayLayout {
     TOP,
     RIGHT,
@@ -37,8 +37,8 @@ class ASH_EXPORT DisplayController : public aura::DisplayObserver {
     LEFT
   };
 
-  DisplayController();
-  virtual ~DisplayController();
+  MonitorController();
+  virtual ~MonitorController();
 
   // Initializes primary display.
   void InitPrimaryDisplay();
@@ -100,10 +100,10 @@ class ASH_EXPORT DisplayController : public aura::DisplayObserver {
 
   SecondaryDisplayLayout secondary_display_layout_;
 
-  DISALLOW_COPY_AND_ASSIGN(DisplayController);
+  DISALLOW_COPY_AND_ASSIGN(MonitorController);
 };
 
 }  // namespace internal
 }  // namespace ash
 
-#endif  // ASH_DISPLAY_DISPLAY_CONTROLLER_H_
+#endif  // ASH_MONITOR_MONITOR_CONTROLLER_H_
diff --git a/ash/display/mouse_cursor_event_filter.cc b/ash/monitor/mouse_cursor_event_filter.cc
index 0ab6f1c..0c451d1 100644
--- a/ash/display/mouse_cursor_event_filter.cc
+++ b/ash/monitor/mouse_cursor_event_filter.cc
@@ -2,9 +2,9 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/display/mouse_cursor_event_filter.h"
+#include "ash/monitor/mouse_cursor_event_filter.h"
 
-#include "ash/display/display_controller.h"
+#include "ash/monitor/monitor_controller.h"
 #include "ui/aura/event.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/window.h"
@@ -13,9 +13,9 @@ namespace ash {
 namespace internal {
 
 MouseCursorEventFilter::MouseCursorEventFilter(
-    DisplayController* display_controller)
-    : display_controller_(display_controller) {
-  DCHECK(display_controller_);
+    MonitorController* monitor_controller)
+    : monitor_controller_(monitor_controller) {
+  DCHECK(monitor_controller_);
 }
 
 MouseCursorEventFilter::~MouseCursorEventFilter() {
@@ -33,7 +33,7 @@ bool MouseCursorEventFilter::PreHandleMouseEvent(aura::Window* target,
   aura::RootWindow* current_root = target->GetRootWindow();
   gfx::Point location_in_root(event->location());
   aura::Window::ConvertPointToWindow(target, current_root, &location_in_root);
-  return display_controller_->WarpMouseCursorIfNecessary(
+  return monitor_controller_->WarpMouseCursorIfNecessary(
       current_root, location_in_root);
 }
 
diff --git a/ash/display/mouse_cursor_event_filter.h b/ash/monitor/mouse_cursor_event_filter.h
index a89a6b7..682547a 100644
--- a/ash/display/mouse_cursor_event_filter.h
+++ b/ash/monitor/mouse_cursor_event_filter.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_DISPLAY_MOUSE_CURSOR_EVENT_FILTER_H
-#define ASH_DISPLAY_MOUSE_CURSOR_EVENT_FILTER_H
+#ifndef ASH_MONITOR_MOUSE_CURSOR_EVENT_FILTER_H
+#define ASH_MONITOR_MOUSE_CURSOR_EVENT_FILTER_H
 #pragma once
 
 #include "ash/ash_export.h"
@@ -12,13 +12,13 @@
 
 namespace ash {
 namespace internal {
-class DisplayController;
+class MonitorController;
 
 // An event filter that controls mouse location in extended desktop
 // environment.
 class ASH_EXPORT MouseCursorEventFilter : public aura::EventFilter {
  public:
-  MouseCursorEventFilter(DisplayController* display_controller);
+  MouseCursorEventFilter(MonitorController* monitor_controller);
   virtual ~MouseCursorEventFilter();
 
   // Overridden from aura::EventFilter:
@@ -33,7 +33,7 @@ class ASH_EXPORT MouseCursorEventFilter : public aura::EventFilter {
       aura::GestureEvent* event) OVERRIDE;
 
  private:
-  DisplayController* display_controller_;
+  MonitorController* monitor_controller_;
 
   DISALLOW_COPY_AND_ASSIGN(MouseCursorEventFilter);
 };
@@ -41,4 +41,4 @@ class ASH_EXPORT MouseCursorEventFilter : public aura::EventFilter {
 }  // namespace internal
 }  // namespace ash
 
-#endif  // ASH_DISPLAY_MOUSE_CURSOR_EVENT_FILTER_H
+#endif  // ASH_MONITOR_MOUSE_CURSOR_EVENT_FILTER_H
diff --git a/ash/display/multi_display_manager.cc b/ash/monitor/multi_monitor_manager.cc
index 54b3d74..70bf90d 100644
--- a/ash/display/multi_display_manager.cc
+++ b/ash/monitor/multi_monitor_manager.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/display/multi_display_manager.h"
+#include "ash/monitor/multi_monitor_manager.h"
 
 #include <string>
 #include <vector>
@@ -36,46 +36,46 @@ using aura::Window;
 using std::string;
 using std::vector;
 
-DEFINE_WINDOW_PROPERTY_KEY(int, kDisplayIdKey, -1);
+DEFINE_WINDOW_PROPERTY_KEY(int, kMonitorIdKey, -1);
 
-MultiDisplayManager::MultiDisplayManager() {
+MultiMonitorManager::MultiMonitorManager() {
   Init();
 }
 
-MultiDisplayManager::~MultiDisplayManager() {
+MultiMonitorManager::~MultiMonitorManager() {
 }
 
 // static
-void MultiDisplayManager::AddRemoveDisplay() {
-  MultiDisplayManager* manager = static_cast<MultiDisplayManager*>(
-      aura::Env::GetInstance()->display_manager());
-  manager->AddRemoveDisplayImpl();
+void MultiMonitorManager::AddRemoveMonitor() {
+  MultiMonitorManager* manager = static_cast<MultiMonitorManager*>(
+      aura::Env::GetInstance()->monitor_manager());
+  manager->AddRemoveMonitorImpl();
 }
 
-void MultiDisplayManager::CycleDisplay() {
-  MultiDisplayManager* manager = static_cast<MultiDisplayManager*>(
-      aura::Env::GetInstance()->display_manager());
-  manager->CycleDisplayImpl();
+void MultiMonitorManager::CycleMonitor() {
+  MultiMonitorManager* manager = static_cast<MultiMonitorManager*>(
+      aura::Env::GetInstance()->monitor_manager());
+  manager->CycleMonitorImpl();
 }
 
-  void MultiDisplayManager::ToggleDisplayScale() {
-  MultiDisplayManager* manager = static_cast<MultiDisplayManager*>(
-      aura::Env::GetInstance()->display_manager());
-  manager->ScaleDisplayImpl();
+  void MultiMonitorManager::ToggleMonitorScale() {
+  MultiMonitorManager* manager = static_cast<MultiMonitorManager*>(
+      aura::Env::GetInstance()->monitor_manager());
+  manager->ScaleMonitorImpl();
 }
 
-void MultiDisplayManager::OnNativeDisplaysChanged(
+void MultiMonitorManager::OnNativeMonitorsChanged(
     const std::vector<gfx::Display>& new_displays) {
   size_t min = std::min(displays_.size(), new_displays.size());
 
-  // For m19, we only care about 1st display as primary, and
-  // don't differentiate the rest of displays as all secondary
-  // displays have the same content. ID for primary display stays the same
-  // because we never remove it, we don't update IDs for other displays
+  // For m19, we only care about 1st monitor as primary, and
+  // don't differentiate the rest of monitors as all secondary
+  // monitors have the same content. ID for primary monitor stays the same
+  // because we never remove it, we don't update IDs for other monitors
   // , for now, because they're the same.
   // TODO(oshima): Fix this so that we can differentiate outputs
-  // and keep a content on one display stays on the same display
-  // when a display is added or removed.
+  // and keep a content on one monitor stays on the same monitor
+  // when a monitor is added or removed.
   for (size_t i = 0; i < min; ++i) {
     gfx::Display& current_display = displays_[i];
     const gfx::Display& new_display = new_displays[i];
@@ -89,7 +89,7 @@ void MultiDisplayManager::OnNativeDisplaysChanged(
   }
 
   if (displays_.size() < new_displays.size()) {
-    // New displays added
+    // New monitors added
     for (size_t i = min; i < new_displays.size(); ++i) {
       const gfx::Display& new_display = new_displays[i];
       displays_.push_back(gfx::Display(new_display.id()));
@@ -102,8 +102,8 @@ void MultiDisplayManager::OnNativeDisplaysChanged(
       NotifyDisplayAdded(display);
     }
   } else {
-    // Displays are removed. We keep the display for the primary
-    // display (at index 0) because it needs the display information
+    // Monitors are removed. We keep the monitor for the primary
+    // monitor (at index 0) because it needs the monitor information
     // even if it doesn't exit.
     while (displays_.size() > new_displays.size() && displays_.size() > 1) {
       Displays::reverse_iterator iter = displays_.rbegin();
@@ -113,45 +113,45 @@ void MultiDisplayManager::OnNativeDisplaysChanged(
   }
 }
 
-RootWindow* MultiDisplayManager::CreateRootWindowForDisplay(
+RootWindow* MultiMonitorManager::CreateRootWindowForMonitor(
     const gfx::Display& display) {
   RootWindow* root_window = new RootWindow(display.bounds_in_pixel());
   // No need to remove RootWindowObserver because
-  // the DisplayManager object outlives RootWindow objects.
+  // the MonitorManager object outlives RootWindow objects.
   root_window->AddRootWindowObserver(this);
-  root_window->SetProperty(kDisplayIdKey, display.id());
+  root_window->SetProperty(kMonitorIdKey, display.id());
   root_window->Init();
   return root_window;
 }
 
-const gfx::Display& MultiDisplayManager::GetDisplayAt(size_t index) {
+const gfx::Display& MultiMonitorManager::GetDisplayAt(size_t index) {
   return index < displays_.size() ? displays_[index] : GetInvalidDisplay();
 }
 
-size_t MultiDisplayManager::GetNumDisplays() const {
+size_t MultiMonitorManager::GetNumDisplays() const {
   return displays_.size();
 }
 
-const gfx::Display& MultiDisplayManager::GetDisplayNearestWindow(
+const gfx::Display& MultiMonitorManager::GetDisplayNearestWindow(
     const Window* window) const {
   if (!window) {
-    MultiDisplayManager* manager = const_cast<MultiDisplayManager*>(this);
+    MultiMonitorManager* manager = const_cast<MultiMonitorManager*>(this);
     return manager->GetDisplayAt(0);
   }
   const RootWindow* root = window->GetRootWindow();
-  MultiDisplayManager* manager = const_cast<MultiDisplayManager*>(this);
+  MultiMonitorManager* manager = const_cast<MultiMonitorManager*>(this);
   return root ? manager->FindDisplayForRootWindow(root) : GetInvalidDisplay();
 }
 
-const gfx::Display& MultiDisplayManager::GetDisplayNearestPoint(
+const gfx::Display& MultiMonitorManager::GetDisplayNearestPoint(
     const gfx::Point& point) const {
   // TODO(oshima): For m19, mouse is constrained within
   // the primary window.
-  MultiDisplayManager* manager = const_cast<MultiDisplayManager*>(this);
+  MultiMonitorManager* manager = const_cast<MultiMonitorManager*>(this);
   return manager->GetDisplayAt(0);
 }
 
-void MultiDisplayManager::OnRootWindowResized(const aura::RootWindow* root,
+void MultiMonitorManager::OnRootWindowResized(const aura::RootWindow* root,
                                               const gfx::Size& old_size) {
   if (!use_fullscreen_host_window()) {
     gfx::Display& display = FindDisplayForRootWindow(root);
@@ -160,7 +160,7 @@ void MultiDisplayManager::OnRootWindowResized(const aura::RootWindow* root,
   }
 }
 
-bool MultiDisplayManager::UpdateWorkAreaOfDisplayNearestWindow(
+bool MultiMonitorManager::UpdateWorkAreaOfMonitorNearestWindow(
     const aura::Window* window,
     const gfx::Insets& insets) {
   const RootWindow* root = window->GetRootWindow();
@@ -170,23 +170,23 @@ bool MultiDisplayManager::UpdateWorkAreaOfDisplayNearestWindow(
   return old_work_area != display.work_area();
 }
 
-void MultiDisplayManager::Init() {
-  // TODO(oshima): Move this logic to DisplayChangeObserver.
+void MultiMonitorManager::Init() {
+  // TODO(oshima): Move this logic to MonitorChangeObserver.
   const string size_str = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
       switches::kAuraHostWindowSize);
   vector<string> parts;
   base::SplitString(size_str, ',', &parts);
   for (vector<string>::const_iterator iter = parts.begin();
        iter != parts.end(); ++iter) {
-    displays_.push_back(CreateDisplayFromSpec(*iter));
+    displays_.push_back(CreateMonitorFromSpec(*iter));
   }
   if (displays_.empty())
-    displays_.push_back(CreateDisplayFromSpec("" /* default */));
+    displays_.push_back(CreateMonitorFromSpec("" /* default */));
   // Force the 1st display to be the primary display (id == 0).
   displays_[0].set_id(0);
 }
 
-void MultiDisplayManager::AddRemoveDisplayImpl() {
+void MultiMonitorManager::AddRemoveMonitorImpl() {
   std::vector<gfx::Display> new_displays;
   if (displays_.size() > 1) {
     // Remove if there is more than one display.
@@ -196,13 +196,13 @@ void MultiDisplayManager::AddRemoveDisplayImpl() {
   } else {
     // Add if there is only one display.
     new_displays.push_back(displays_[0]);
-    new_displays.push_back(CreateDisplayFromSpec("50+50-1280x768"));
+    new_displays.push_back(CreateMonitorFromSpec("50+50-1280x768"));
   }
   if (new_displays.size())
-    OnNativeDisplaysChanged(new_displays);
+    OnNativeMonitorsChanged(new_displays);
 }
 
-void MultiDisplayManager::CycleDisplayImpl() {
+void MultiMonitorManager::CycleMonitorImpl() {
   if (displays_.size() > 1) {
     std::vector<gfx::Display> new_displays;
     for (Displays::const_iterator iter = displays_.begin() + 1;
@@ -211,11 +211,11 @@ void MultiDisplayManager::CycleDisplayImpl() {
       new_displays.push_back(display);
     }
     new_displays.push_back(displays_.front());
-    OnNativeDisplaysChanged(new_displays);
+    OnNativeMonitorsChanged(new_displays);
   }
 }
 
-void MultiDisplayManager::ScaleDisplayImpl() {
+void MultiMonitorManager::ScaleMonitorImpl() {
   if (displays_.size() > 0) {
     std::vector<gfx::Display> new_displays;
     for (Displays::const_iterator iter = displays_.begin();
@@ -227,13 +227,13 @@ void MultiDisplayManager::ScaleDisplayImpl() {
                             display.size().Scale(factor)));
       new_displays.push_back(display);
     }
-    OnNativeDisplaysChanged(new_displays);
+    OnNativeMonitorsChanged(new_displays);
   }
 }
 
-gfx::Display& MultiDisplayManager::FindDisplayForRootWindow(
+gfx::Display& MultiMonitorManager::FindDisplayForRootWindow(
     const aura::RootWindow* root_window) {
-  int id = root_window->GetProperty(kDisplayIdKey);
+  int id = root_window->GetProperty(kMonitorIdKey);
   for (Displays::iterator iter = displays_.begin();
        iter != displays_.end(); ++iter) {
     if ((*iter).id() == id)
diff --git a/ash/display/multi_display_manager.h b/ash/monitor/multi_monitor_manager.h
index 3aae410..3849dfe 100644
--- a/ash/display/multi_display_manager.h
+++ b/ash/monitor/multi_monitor_manager.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_DISPLAY_MULTI_DISPLAY_MANAGER_H_
-#define ASH_DISPLAY_MULTI_DISPLAY_MANAGER_H_
+#ifndef ASH_MONITOR_MULTI_MONITOR_MANAGER_H_
+#define ASH_MONITOR_MULTI_MONITOR_MANAGER_H_
 #pragma once
 
 #include <vector>
@@ -11,7 +11,7 @@
 #include "ash/ash_export.h"
 #include "base/compiler_specific.h"
 #include "base/gtest_prod_util.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window_observer.h"
 #include "ui/aura/window.h"
 
@@ -23,31 +23,31 @@ class Display;
 namespace ash {
 namespace internal {
 
-// MultiDisplayManager maintains the current display configurations,
+// MultiMonitorManager maintains the current monitor configurations,
 // and notifies observers when configuration changes.
 // This is exported for unittest.
 //
 // TODO(oshima): gfx::Screen needs to return translated coordinates
 // if the root window is translated. crbug.com/119268.
-class ASH_EXPORT MultiDisplayManager : public aura::DisplayManager,
+class ASH_EXPORT MultiMonitorManager : public aura::MonitorManager,
                                        public aura::RootWindowObserver {
  public:
-  MultiDisplayManager();
-  virtual ~MultiDisplayManager();
+  MultiMonitorManager();
+  virtual ~MultiMonitorManager();
 
-  // Used to emulate display change when run in a desktop environment instead
+  // Used to emulate monitor change when run in a desktop environment instead
   // of on a device.
-  static void AddRemoveDisplay();
-  static void CycleDisplay();
-  static void ToggleDisplayScale();
+  static void AddRemoveMonitor();
+  static void CycleMonitor();
+  static void ToggleMonitorScale();
 
-  bool UpdateWorkAreaOfDisplayNearestWindow(const aura::Window* window,
+  bool UpdateWorkAreaOfMonitorNearestWindow(const aura::Window* window,
                                             const gfx::Insets& insets);
 
-  // DisplayManager overrides:
-  virtual void OnNativeDisplaysChanged(
+  // MonitorManager overrides:
+  virtual void OnNativeMonitorsChanged(
       const std::vector<gfx::Display>& displays) OVERRIDE;
-  virtual aura::RootWindow* CreateRootWindowForDisplay(
+  virtual aura::RootWindow* CreateRootWindowForMonitor(
       const gfx::Display& display) OVERRIDE;
   virtual const gfx::Display& GetDisplayAt(size_t index) OVERRIDE;
 
@@ -66,19 +66,19 @@ class ASH_EXPORT MultiDisplayManager : public aura::DisplayManager,
   typedef std::vector<gfx::Display> Displays;
 
   void Init();
-  void AddRemoveDisplayImpl();
-  void CycleDisplayImpl();
-  void ScaleDisplayImpl();
+  void AddRemoveMonitorImpl();
+  void CycleMonitorImpl();
+  void ScaleMonitorImpl();
   gfx::Display& FindDisplayForRootWindow(const aura::RootWindow* root);
 
   Displays displays_;
 
-  DISALLOW_COPY_AND_ASSIGN(MultiDisplayManager);
+  DISALLOW_COPY_AND_ASSIGN(MultiMonitorManager);
 };
 
-extern const aura::WindowProperty<int>* const kDisplayIdKey;
+extern const aura::WindowProperty<int>* const kMonitorIdKey;
 
 }  // namespace internal
 }  // namespace ash
 
-#endif  // ASH_DISPLAY_MULTI_DISPLAY_MANAGER_H_
+#endif  // ASH_MONITOR_MULTI_MONITOR_MANAGER_H_
diff --git a/ash/display/multi_display_manager_unittest.cc b/ash/monitor/multi_monitor_manager_unittest.cc
index b1adc53..94a28cd 100644
--- a/ash/display/multi_display_manager_unittest.cc
+++ b/ash/monitor/multi_monitor_manager_unittest.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/display/multi_display_manager.h"
+#include "ash/monitor/multi_monitor_manager.h"
 
 #include "ash/shell.h"
 #include "ash/test/ash_test_base.h"
@@ -20,29 +20,29 @@ namespace test {
 using std::vector;
 using std::string;
 
-class MultiDisplayManagerTest : public test::AshTestBase,
+class MultiMonitorManagerTest : public test::AshTestBase,
                                 public aura::DisplayObserver,
                                 public aura::WindowObserver {
  public:
-  MultiDisplayManagerTest()
+  MultiMonitorManagerTest()
       : removed_count_(0U),
         root_window_destroyed_(false) {
   }
-  virtual ~MultiDisplayManagerTest() {}
+  virtual ~MultiMonitorManagerTest() {}
 
   virtual void SetUp() OVERRIDE {
     AshTestBase::SetUp();
-    display_manager()->AddObserver(this);
+    monitor_manager()->AddObserver(this);
     Shell::GetPrimaryRootWindow()->AddObserver(this);
   }
   virtual void TearDown() OVERRIDE {
     Shell::GetPrimaryRootWindow()->RemoveObserver(this);
-    display_manager()->RemoveObserver(this);
+    monitor_manager()->RemoveObserver(this);
     AshTestBase::TearDown();
   }
 
-  aura::DisplayManager* display_manager() {
-    return aura::Env::GetInstance()->display_manager();
+  aura::MonitorManager* monitor_manager() {
+    return aura::Env::GetInstance()->monitor_manager();
   }
   const vector<gfx::Display>& changed() const { return changed_; }
   const vector<gfx::Display>& added() const { return added_; }
@@ -86,101 +86,101 @@ class MultiDisplayManagerTest : public test::AshTestBase,
   size_t removed_count_;
   bool root_window_destroyed_;
 
-  DISALLOW_COPY_AND_ASSIGN(MultiDisplayManagerTest);
+  DISALLOW_COPY_AND_ASSIGN(MultiMonitorManagerTest);
 };
 
-TEST_F(MultiDisplayManagerTest, NativeDisplayTest) {
-  aura::DisplayManager::set_use_fullscreen_host_window(true);
+TEST_F(MultiMonitorManagerTest, NativeMonitorTest) {
+  aura::MonitorManager::set_use_fullscreen_host_window(true);
 
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
 
   // Update primary and add seconary.
-  UpdateDisplay("0+0-500x500,0+501-400x400");
-  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
+  UpdateMonitor("0+0-500x500,0+501-400x400");
+  EXPECT_EQ(2U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("1 1 0", GetCountSummary());
-  EXPECT_EQ(display_manager()->GetDisplayAt(0).id(), changed()[0].id());
-  EXPECT_EQ(display_manager()->GetDisplayAt(1).id(), added()[0].id());
+  EXPECT_EQ(monitor_manager()->GetDisplayAt(0).id(), changed()[0].id());
+  EXPECT_EQ(monitor_manager()->GetDisplayAt(1).id(), added()[0].id());
   EXPECT_EQ("0,0 500x500", changed()[0].bounds().ToString());
   EXPECT_EQ("0,0 400x400", added()[0].bounds().ToString());
   EXPECT_EQ("0,501 400x400", added()[0].bounds_in_pixel().ToString());
   reset();
 
   // Delete secondary.
-  UpdateDisplay("0+0-500x500");
+  UpdateMonitor("0+0-500x500");
   EXPECT_EQ("0 0 1", GetCountSummary());
   reset();
 
   // Change primary.
-  UpdateDisplay("0+0-1000x600");
+  UpdateMonitor("0+0-1000x600");
   EXPECT_EQ("1 0 0", GetCountSummary());
-  EXPECT_EQ(display_manager()->GetDisplayAt(0).id(), changed()[0].id());
+  EXPECT_EQ(monitor_manager()->GetDisplayAt(0).id(), changed()[0].id());
   EXPECT_EQ("0,0 1000x600", changed()[0].bounds().ToString());
   reset();
 
   // Add secondary.
-  UpdateDisplay("0+0-1000x600,1001+0-600x400");
-  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
+  UpdateMonitor("0+0-1000x600,1001+0-600x400");
+  EXPECT_EQ(2U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("0 1 0", GetCountSummary());
-  EXPECT_EQ(display_manager()->GetDisplayAt(1).id(), added()[0].id());
+  EXPECT_EQ(monitor_manager()->GetDisplayAt(1).id(), added()[0].id());
   EXPECT_EQ("0,0 600x400", added()[0].bounds().ToString());
   EXPECT_EQ("1001,0 600x400", added()[0].bounds_in_pixel().ToString());
   reset();
 
   // Secondary removed, primary changed.
-  UpdateDisplay("0+0-800x300");
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+  UpdateMonitor("0+0-800x300");
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("1 0 1", GetCountSummary());
-  EXPECT_EQ(display_manager()->GetDisplayAt(0).id(), changed()[0].id());
+  EXPECT_EQ(monitor_manager()->GetDisplayAt(0).id(), changed()[0].id());
   EXPECT_EQ("0,0 800x300", changed()[0].bounds().ToString());
   reset();
 
   // # of display can go to zero when screen is off.
   const vector<gfx::Display> empty;
-  display_manager()->OnNativeDisplaysChanged(empty);
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+  monitor_manager()->OnNativeMonitorsChanged(empty);
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("0 0 0", GetCountSummary());
   EXPECT_FALSE(root_window_destroyed());
-  // Display configuration stays the same
+  // Monitor configuration stays the same
   EXPECT_EQ("0,0 800x300",
-            display_manager()->GetDisplayAt(0).bounds().ToString());
+            monitor_manager()->GetDisplayAt(0).bounds().ToString());
   reset();
 
-  // Connect to display again
-  UpdateDisplay("100+100-500x400");
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+  // Connect to monitor again
+  UpdateMonitor("100+100-500x400");
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("1 0 0", GetCountSummary());
   EXPECT_FALSE(root_window_destroyed());
   EXPECT_EQ("0,0 500x400", changed()[0].bounds().ToString());
   EXPECT_EQ("100,100 500x400", changed()[0].bounds_in_pixel().ToString());
   reset();
 
-  // Go back to zero and wake up with multiple displays.
-  display_manager()->OnNativeDisplaysChanged(empty);
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+  // Go back to zero and wake up with multiple monitors.
+  monitor_manager()->OnNativeMonitorsChanged(empty);
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
   EXPECT_FALSE(root_window_destroyed());
   reset();
 
   // Add secondary.
-  UpdateDisplay("0+0-1000x600,1000+0-600x400");
-  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
+  UpdateMonitor("0+0-1000x600,1000+0-600x400");
+  EXPECT_EQ(2U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("0,0 1000x600",
-            display_manager()->GetDisplayAt(0).bounds().ToString());
+            monitor_manager()->GetDisplayAt(0).bounds().ToString());
   EXPECT_EQ("0,0 600x400",
-            display_manager()->GetDisplayAt(1).bounds().ToString());
+            monitor_manager()->GetDisplayAt(1).bounds().ToString());
   EXPECT_EQ("1000,0 600x400",
-            display_manager()->GetDisplayAt(1).bounds_in_pixel().ToString());
+            monitor_manager()->GetDisplayAt(1).bounds_in_pixel().ToString());
   reset();
 
-  aura::DisplayManager::set_use_fullscreen_host_window(false);
+  aura::MonitorManager::set_use_fullscreen_host_window(false);
 }
 
 // Test in emulation mode (use_fullscreen_host_window=false)
-TEST_F(MultiDisplayManagerTest, EmulatorTest) {
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+TEST_F(MultiMonitorManagerTest, EmulatorTest) {
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
 
-  internal::MultiDisplayManager::AddRemoveDisplay();
+  internal::MultiMonitorManager::AddRemoveMonitor();
   // Update primary and add seconary.
-  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
+  EXPECT_EQ(2U, monitor_manager()->GetNumDisplays());
 #if defined(OS_WIN)
   // TODO(oshima): Windows receives resize event for some reason.
   EXPECT_EQ("1 1 0", GetCountSummary());
@@ -189,22 +189,22 @@ TEST_F(MultiDisplayManagerTest, EmulatorTest) {
 #endif
   reset();
 
-  internal::MultiDisplayManager::CycleDisplay();
-  EXPECT_EQ(2U, display_manager()->GetNumDisplays());
+  internal::MultiMonitorManager::CycleMonitor();
+  EXPECT_EQ(2U, monitor_manager()->GetNumDisplays());
   // Observer gets called twice in this mode because
-  // it gets notified both from |OnNativeDisplayChagned|
+  // it gets notified both from |OnNativeMonitorChagned|
   // and from |RootWindowObserver|, which is the consequence of
   // |SetHostSize()|.
   EXPECT_EQ("4 0 0", GetCountSummary());
   reset();
 
-  internal::MultiDisplayManager::AddRemoveDisplay();
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+  internal::MultiMonitorManager::AddRemoveMonitor();
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("0 0 1", GetCountSummary());
   reset();
 
-  internal::MultiDisplayManager::CycleDisplay();
-  EXPECT_EQ(1U, display_manager()->GetNumDisplays());
+  internal::MultiMonitorManager::CycleMonitor();
+  EXPECT_EQ(1U, monitor_manager()->GetNumDisplays());
   EXPECT_EQ("0 0 0", GetCountSummary());
   reset();
 }
@@ -216,19 +216,19 @@ TEST_F(MultiDisplayManagerTest, EmulatorTest) {
 #define MAYBE_TestDeviceScaleOnlyChange DISABLED_TestDeviceScaleOnlyChange
 #endif
 
-TEST_F(MultiDisplayManagerTest, MAYBE_TestDeviceScaleOnlyChange) {
-  aura::DisplayManager::set_use_fullscreen_host_window(true);
-  UpdateDisplay("0+0-1000x600");
+TEST_F(MultiMonitorManagerTest, MAYBE_TestDeviceScaleOnlyChange) {
+  aura::MonitorManager::set_use_fullscreen_host_window(true);
+  UpdateMonitor("0+0-1000x600");
   EXPECT_EQ(1,
             Shell::GetPrimaryRootWindow()->compositor()->device_scale_factor());
   EXPECT_EQ("1000x600",
             Shell::GetPrimaryRootWindow()->bounds().size().ToString());
-  UpdateDisplay("0+0-1000x600*2");
+  UpdateMonitor("0+0-1000x600*2");
   EXPECT_EQ(2,
             Shell::GetPrimaryRootWindow()->compositor()->device_scale_factor());
   EXPECT_EQ("500x300",
             Shell::GetPrimaryRootWindow()->bounds().size().ToString());
-  aura::DisplayManager::set_use_fullscreen_host_window(false);
+  aura::MonitorManager::set_use_fullscreen_host_window(false);
 }
 
 }  // namespace test
diff --git a/ash/display/secondary_display_view.cc b/ash/monitor/secondary_monitor_view.cc
index ea8963e..ad9b250 100644
--- a/ash/display/secondary_display_view.cc
+++ b/ash/monitor/secondary_monitor_view.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/display/secondary_display_view.h"
+#include "ash/monitor/secondary_monitor_view.h"
 
 #include "grit/ash_strings.h"
 #include "grit/ui_resources.h"
@@ -24,13 +24,13 @@ namespace {
 const SkColor kBackgroundColor = SkColorSetRGB(0x33, 0x33, 0x33);
 const SkColor kTextColor = SkColorSetRGB(127, 127, 127);
 
-// A view to be displayed on secondary display.
-class SecondaryDisplayView : public views::WidgetDelegateView {
+// A view to be displayed on secondary monitor.
+class SecondaryMonitorView : public views::WidgetDelegateView {
  public:
-  SecondaryDisplayView() {
+  SecondaryMonitorView() {
     Init();
   }
-  virtual ~SecondaryDisplayView() {
+  virtual ~SecondaryMonitorView() {
   }
 
   void Init() {
@@ -89,22 +89,22 @@ class SecondaryDisplayView : public views::WidgetDelegateView {
   views::Label* shortcut_text_;
   views::ImageView* shortcut_image_;
 
-  DISALLOW_COPY_AND_ASSIGN(SecondaryDisplayView);
+  DISALLOW_COPY_AND_ASSIGN(SecondaryMonitorView);
 };
 
 }  // namespace
 
-views::Widget* CreateSecondaryDisplayWidget(aura::Window* parent) {
+views::Widget* CreateSecondaryMonitorWidget(aura::Window* parent) {
   views::Widget* desktop_widget = new views::Widget;
   views::Widget::InitParams params(
       views::Widget::InitParams::TYPE_WINDOW_FRAMELESS);
-  SecondaryDisplayView* view = new SecondaryDisplayView();
+  SecondaryMonitorView* view = new SecondaryMonitorView();
   params.delegate = view;
   params.parent = parent;
   desktop_widget->Init(params);
   desktop_widget->SetContentsView(view);
   desktop_widget->Show();
-  desktop_widget->GetNativeView()->SetName("SecondaryDisplay");
+  desktop_widget->GetNativeView()->SetName("SecondaryMonitor");
   return desktop_widget;
 }
 
diff --git a/ash/display/secondary_display_view.h b/ash/monitor/secondary_monitor_view.h
index 60db1e0..cca03d2 100644
--- a/ash/display/secondary_display_view.h
+++ b/ash/monitor/secondary_monitor_view.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef ASH_DISPLAY_SECONDARY_DISPLAY_VIEW_H_
-#define ASH_DISPLAY_SECONDARY_DISPLAY_VIEW_H_
+#ifndef ASH_MONITOR_SECONDARY_MONITOR_VIEW_H_
+#define ASH_MONITOR_SECONDARY_MONITOR_VIEW_H_
 #pragma once
 
 namespace aura {
@@ -17,9 +17,9 @@ class Widget;
 namespace ash {
 
 // Creates the widget that hosts the static message displayed on the
-// secondary display.
-views::Widget* CreateSecondaryDisplayWidget(aura::Window* parent);
+// secondary monitor.
+views::Widget* CreateSecondaryMonitorWidget(aura::Window* parent);
 
 }  // namespace ash
 
-#endif  // ASH_DISPLAY_SECONDARY_DISPLAY_VIEW_H_
+#endif  // ASH_MONITOR_SECONDARY_MONITOR_VIEW_H_
diff --git a/ash/root_window_controller_unittest.cc b/ash/root_window_controller_unittest.cc
index 8fd4acc..050f760 100644
--- a/ash/root_window_controller_unittest.cc
+++ b/ash/root_window_controller_unittest.cc
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ash/display/display_controller.h"
-#include "ash/display/multi_display_manager.h"
+#include "ash/monitor/monitor_controller.h"
+#include "ash/monitor/multi_monitor_manager.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/test/ash_test_base.h"
@@ -67,15 +67,15 @@ class RootWindowControllerTest : public test::AshTestBase {
   virtual ~RootWindowControllerTest() {}
 
   virtual void SetUp() OVERRIDE {
-    internal::DisplayController::SetExtendedDesktopEnabled(true);
-    internal::DisplayController::SetVirtualScreenCoordinatesEnabled(true);
+    internal::MonitorController::SetExtendedDesktopEnabled(true);
+    internal::MonitorController::SetVirtualScreenCoordinatesEnabled(true);
     AshTestBase::SetUp();
   }
 
   virtual void TearDown() OVERRIDE {
     AshTestBase::TearDown();
-    internal::DisplayController::SetExtendedDesktopEnabled(false);
-    internal::DisplayController::SetVirtualScreenCoordinatesEnabled(false);
+    internal::MonitorController::SetExtendedDesktopEnabled(false);
+    internal::MonitorController::SetVirtualScreenCoordinatesEnabled(false);
   }
 
  private:
@@ -83,7 +83,7 @@ class RootWindowControllerTest : public test::AshTestBase {
 };
 
 TEST_F(RootWindowControllerTest, MoveWindows_Basic) {
-  UpdateDisplay("0+0-600x600,600+0-500x500");
+  UpdateMonitor("0+0-600x600,600+0-500x500");
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   // Emulate virtual screen coordinate system.
   root_windows[0]->SetBounds(gfx::Rect(0, 0, 600, 600));
@@ -114,12 +114,12 @@ TEST_F(RootWindowControllerTest, MoveWindows_Basic) {
   EXPECT_EQ("500x500", fullscreen->GetWindowScreenBounds().size().ToString());
 #endif
 
-  UpdateDisplay("0+0-600x600");
+  UpdateMonitor("0+0-600x600");
 
   EXPECT_EQ(root_windows[0], normal->GetNativeView()->GetRootWindow());
   EXPECT_EQ("100x100", normal->GetWindowScreenBounds().size().ToString());
 
-  // Maximized area on primary display has 2px (given as
+  // Maximized area on primary monitor has 2px (given as
   // kAutoHideSize in shelf_layout_manager.cc) inset at the bottom.
   EXPECT_EQ(root_windows[0], maximized->GetNativeView()->GetRootWindow());
   EXPECT_EQ("600x598", maximized->GetWindowScreenBounds().size().ToString());
@@ -133,7 +133,7 @@ TEST_F(RootWindowControllerTest, MoveWindows_Basic) {
 }
 
 TEST_F(RootWindowControllerTest, MoveWindows_Modal) {
-  UpdateDisplay("0+0-500x500,500+0-500x500");
+  UpdateMonitor("0+0-500x500,500+0-500x500");
 
   Shell::RootWindowList root_windows = Shell::GetAllRootWindows();
   // Emulate virtual screen coordinate system.
@@ -154,7 +154,7 @@ TEST_F(RootWindowControllerTest, MoveWindows_Modal) {
   generator_1st.ClickLeftButton();
   EXPECT_TRUE(wm::IsActiveWindow(modal->GetNativeView()));
 
-  UpdateDisplay("0+0-500x500");
+  UpdateMonitor("0+0-500x500");
   EXPECT_EQ(root_windows[0], modal->GetNativeView()->GetRootWindow());
   EXPECT_TRUE(wm::IsActiveWindow(modal->GetNativeView()));
   generator_1st.ClickLeftButton();
diff --git a/ash/screen_ash.cc b/ash/screen_ash.cc
index c98996a..e444ebf 100644
--- a/ash/screen_ash.cc
+++ b/ash/screen_ash.cc
@@ -8,7 +8,7 @@
 #include "ash/wm/shelf_layout_manager.h"
 #include "base/logging.h"
 #include "ui/aura/env.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/screen.h"
@@ -16,8 +16,8 @@
 namespace ash {
 
 namespace {
-aura::DisplayManager* GetDisplayManager() {
-  return aura::Env::GetInstance()->display_manager();
+aura::MonitorManager* GetMonitorManager() {
+  return aura::Env::GetInstance()->monitor_manager();
 }
 }  // namespace
 
@@ -55,19 +55,19 @@ gfx::NativeWindow ScreenAsh::GetWindowAtCursorScreenPoint() {
 }
 
 int ScreenAsh::GetNumDisplays() {
-  return GetDisplayManager()->GetNumDisplays();
+  return GetMonitorManager()->GetNumDisplays();
 }
 
 gfx::Display ScreenAsh::GetDisplayNearestWindow(gfx::NativeView window) const {
-  return GetDisplayManager()->GetDisplayNearestWindow(window);
+  return GetMonitorManager()->GetDisplayNearestWindow(window);
 }
 
 gfx::Display ScreenAsh::GetDisplayNearestPoint(const gfx::Point& point) const {
-  return GetDisplayManager()->GetDisplayNearestPoint(point);
+  return GetMonitorManager()->GetDisplayNearestPoint(point);
 }
 
 gfx::Display ScreenAsh::GetPrimaryDisplay() const {
-  return GetDisplayManager()->GetDisplayAt(0);
+  return GetMonitorManager()->GetDisplayAt(0);
 }
 
 }  // namespace ash
diff --git a/ash/shell.cc b/ash/shell.cc
index 35eee4b..d84b700 100644
--- a/ash/shell.cc
+++ b/ash/shell.cc
@@ -17,10 +17,10 @@
 #include "ash/high_contrast/high_contrast_controller.h"
 #include "ash/launcher/launcher.h"
 #include "ash/magnifier/magnification_controller.h"
-#include "ash/display/display_controller.h"
-#include "ash/display/mouse_cursor_event_filter.h"
-#include "ash/display/multi_display_manager.h"
-#include "ash/display/secondary_display_view.h"
+#include "ash/monitor/monitor_controller.h"
+#include "ash/monitor/mouse_cursor_event_filter.h"
+#include "ash/monitor/multi_monitor_manager.h"
+#include "ash/monitor/secondary_monitor_view.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_ash.h"
 #include "ash/shell_context_menu.h"
@@ -73,7 +73,7 @@
 #include "ui/aura/env.h"
 #include "ui/aura/focus_manager.h"
 #include "ui/aura/layout_manager.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/shared/compound_event_filter.h"
 #include "ui/aura/shared/input_method_event_filter.h"
@@ -97,7 +97,7 @@
 #endif
 
 #if defined(OS_CHROMEOS)
-#include "chromeos/display/output_configurator.h"
+#include "chromeos/monitor/output_configurator.h"
 #include "ui/aura/dispatcher_linux.h"
 #endif  // defined(OS_CHROMEOS)
 
@@ -223,7 +223,7 @@ Shell::~Shell() {
   app_list_controller_.reset();
 
   // Destroy all child windows including widgets.
-  display_controller_->CloseChildWindows();
+  monitor_controller_->CloseChildWindows();
 
   // These need a valid Shell instance to clean up properly, so explicitly
   // delete them before invalidating the instance.
@@ -241,7 +241,7 @@ Shell::~Shell() {
   visibility_controller_.reset();
 
   // This also deletes all RootWindows.
-  display_controller_.reset();
+  monitor_controller_.reset();
 
   // Launcher widget has a InputMethodBridge that references to
   // input_method_filter_'s input_method_. So explicitly release launcher_
@@ -268,8 +268,8 @@ Shell::~Shell() {
 // static
 Shell* Shell::CreateInstance(ShellDelegate* delegate) {
   CHECK(!instance_);
-  aura::Env::GetInstance()->SetDisplayManager(
-      new internal::MultiDisplayManager());
+  aura::Env::GetInstance()->SetMonitorManager(
+      new internal::MultiMonitorManager());
   instance_ = new Shell(delegate);
   instance_->Init();
   return instance_;
@@ -299,13 +299,13 @@ internal::RootWindowController* Shell::GetPrimaryRootWindowController() {
 
 // static
 Shell::RootWindowControllerList Shell::GetAllRootWindowControllers() {
-  return Shell::GetInstance()->display_controller()->
+  return Shell::GetInstance()->monitor_controller()->
       GetAllRootWindowControllers();
 }
 
 // static
 aura::RootWindow* Shell::GetPrimaryRootWindow() {
-  return GetInstance()->display_controller()->GetPrimaryRootWindow();
+  return GetInstance()->monitor_controller()->GetPrimaryRootWindow();
 }
 
 // static
@@ -315,7 +315,7 @@ aura::RootWindow* Shell::GetActiveRootWindow() {
 
 // static
 aura::RootWindow* Shell::GetRootWindowAt(const gfx::Point& point) {
-  if (!internal::DisplayController::IsVirtualScreenCoordinatesEnabled())
+  if (!internal::MonitorController::IsVirtualScreenCoordinatesEnabled())
     return GetPrimaryRootWindow();
   RootWindowList root_windows = GetAllRootWindows();
   for (RootWindowList::const_iterator iter = root_windows.begin();
@@ -331,7 +331,7 @@ aura::RootWindow* Shell::GetRootWindowAt(const gfx::Point& point) {
 
 // static
 aura::RootWindow* Shell::GetRootWindowMatching(const gfx::Rect& rect) {
-  if (!internal::DisplayController::IsVirtualScreenCoordinatesEnabled())
+  if (!internal::MonitorController::IsVirtualScreenCoordinatesEnabled())
     return GetPrimaryRootWindow();
   if (rect.IsEmpty())
     return GetRootWindowAt(rect.origin());
@@ -354,7 +354,7 @@ aura::RootWindow* Shell::GetRootWindowMatching(const gfx::Rect& rect) {
 
 // static
 Shell::RootWindowList Shell::GetAllRootWindows() {
-  return Shell::GetInstance()->display_controller()->
+  return Shell::GetInstance()->monitor_controller()->
       GetAllRootWindows();
 }
 
@@ -390,9 +390,9 @@ void Shell::Init() {
   activation_controller_.reset(
       new internal::ActivationController(focus_manager_.get()));
 
-  display_controller_.reset(new internal::DisplayController);
-  display_controller_->InitPrimaryDisplay();
-  aura::RootWindow* root_window = display_controller_->GetPrimaryRootWindow();
+  monitor_controller_.reset(new internal::MonitorController);
+  monitor_controller_->InitPrimaryDisplay();
+  aura::RootWindow* root_window = monitor_controller_->GetPrimaryRootWindow();
   active_root_window_ = root_window;
 
 #if !defined(OS_MACOSX)
@@ -457,9 +457,9 @@ void Shell::Init() {
   magnification_controller_.reset(
       internal::MagnificationController::CreateInstance());
 
-  if (internal::DisplayController::IsExtendedDesktopEnabled()) {
+  if (internal::MonitorController::IsExtendedDesktopEnabled()) {
     mouse_cursor_filter_.reset(
-        new internal::MouseCursorEventFilter(display_controller_.get()));
+        new internal::MouseCursorEventFilter(monitor_controller_.get()));
     AddEnvEventFilter(mouse_cursor_filter_.get());
   }
 
@@ -511,7 +511,7 @@ void Shell::Init() {
   power_button_controller_.reset(new PowerButtonController);
   AddShellObserver(power_button_controller_.get());
 
-  display_controller_->InitSecondaryDisplays();
+  monitor_controller_->InitSecondaryDisplays();
 
   if (initially_hide_cursor_)
     aura::Env::GetInstance()->cursor_manager()->ShowCursor(false);
@@ -580,15 +580,15 @@ void Shell::RotateFocus(Direction direction) {
                              internal::FocusCycler::BACKWARD);
 }
 
-void Shell::SetDisplayWorkAreaInsets(Window* contains,
+void Shell::SetMonitorWorkAreaInsets(Window* contains,
                                      const gfx::Insets& insets) {
-  internal::MultiDisplayManager* display_manager =
-      static_cast<internal::MultiDisplayManager*>(
-          aura::Env::GetInstance()->display_manager());
-  if (!display_manager->UpdateWorkAreaOfDisplayNearestWindow(contains, insets))
+  internal::MultiMonitorManager* monitor_manager =
+      static_cast<internal::MultiMonitorManager*>(
+          aura::Env::GetInstance()->monitor_manager());
+  if (!monitor_manager->UpdateWorkAreaOfMonitorNearestWindow(contains, insets))
     return;
   FOR_EACH_OBSERVER(ShellObserver, observers_,
-                    OnDisplayWorkAreaInsetsChanged());
+                    OnMonitorWorkAreaInsetsChanged());
 }
 
 void Shell::OnLoginStateChanged(user::LoginStatus status) {
@@ -671,9 +671,9 @@ int Shell::GetGridSize() const {
       workspace_manager()->grid_size();
 }
 
-void Shell::InitRootWindowForSecondaryDisplay(aura::RootWindow* root) {
+void Shell::InitRootWindowForSecondaryMonitor(aura::RootWindow* root) {
   root->set_focus_manager(focus_manager_.get());
-  if (internal::DisplayController::IsExtendedDesktopEnabled()) {
+  if (internal::MonitorController::IsExtendedDesktopEnabled()) {
     internal::RootWindowController* controller =
         new internal::RootWindowController(root);
     controller->CreateContainers();
@@ -687,11 +687,11 @@ void Shell::InitRootWindowForSecondaryDisplay(aura::RootWindow* root) {
     root->SetFocusWhenShown(false);
     root->SetLayoutManager(new internal::RootWindowLayoutManager(root));
     aura::Window* container = new aura::Window(NULL);
-    container->SetName("SecondaryDisplayContainer");
+    container->SetName("SecondaryMonitorContainer");
     container->Init(ui::LAYER_NOT_DRAWN);
     root->AddChild(container);
     container->SetLayoutManager(new internal::BaseLayoutManager(root));
-    CreateSecondaryDisplayWidget(container);
+    CreateSecondaryMonitorWidget(container);
     container->Show();
     root->layout_manager()->OnWindowResized();
     root->ShowRootWindow();
diff --git a/ash/shell.h b/ash/shell.h
index be0a59c..1a0391d 100644
--- a/ash/shell.h
+++ b/ash/shell.h
@@ -83,7 +83,7 @@ class DragDropController;
 class FocusCycler;
 class KeyRewriterEventFilter;
 class MagnificationController;
-class DisplayController;
+class MonitorController;
 class MouseCursorEventFilter;
 class PanelLayoutManager;
 class PartialScreenshotEventFilter;
@@ -219,11 +219,11 @@ class ASH_EXPORT Shell : aura::CursorDelegate {
   // Rotates focus through containers that can receive focus.
   void RotateFocus(Direction direction);
 
-  // Sets the work area insets of the display that contains |window|,
+  // Sets the work area insets of the monitor that contains |window|,
   // this notifies observers too.
   // TODO(sky): this no longer really replicates what happens and is unreliable.
   // Remove this.
-  void SetDisplayWorkAreaInsets(aura::Window* window,
+  void SetMonitorWorkAreaInsets(aura::Window* window,
                                 const gfx::Insets& insets);
 
   // Called when the user logs in.
@@ -279,8 +279,8 @@ class ASH_EXPORT Shell : aura::CursorDelegate {
   internal::FocusCycler* focus_cycler() {
     return focus_cycler_.get();
   }
-  internal::DisplayController* display_controller() {
-    return display_controller_.get();
+  internal::MonitorController* monitor_controller() {
+    return monitor_controller_.get();
   }
 
   ShellDelegate* delegate() { return delegate_.get(); }
@@ -346,8 +346,8 @@ class ASH_EXPORT Shell : aura::CursorDelegate {
     browser_context_ = browser_context;
   }
 
-  // Initializes the root window to be used for a secondary display.
-  void InitRootWindowForSecondaryDisplay(aura::RootWindow* root);
+  // Initializes the root window to be used for a secondary monitor.
+  void InitRootWindowForSecondaryMonitor(aura::RootWindow* root);
 
 #if defined(OS_CHROMEOS)
   chromeos::OutputConfigurator* output_configurator() {
@@ -429,7 +429,7 @@ class ASH_EXPORT Shell : aura::CursorDelegate {
   scoped_ptr<VideoDetector> video_detector_;
   scoped_ptr<WindowCycleController> window_cycle_controller_;
   scoped_ptr<internal::FocusCycler> focus_cycler_;
-  scoped_ptr<internal::DisplayController> display_controller_;
+  scoped_ptr<internal::MonitorController> monitor_controller_;
   scoped_ptr<HighContrastController> high_contrast_controller_;
   scoped_ptr<internal::MagnificationController> magnification_controller_;
   scoped_ptr<aura::FocusManager> focus_manager_;
diff --git a/ash/shell_observer.h b/ash/shell_observer.h
index 3230bb3..4b73efb 100644
--- a/ash/shell_observer.h
+++ b/ash/shell_observer.h
@@ -14,7 +14,7 @@ namespace ash {
 class ASH_EXPORT ShellObserver {
  public:
   // Invoked after the screen's work area insets changes.
-  virtual void OnDisplayWorkAreaInsetsChanged() {}
+  virtual void OnMonitorWorkAreaInsetsChanged() {}
 
   // Invoked when the user logs in.
   virtual void OnLoginStateChanged(user::LoginStatus status) {}
diff --git a/ash/test/ash_test_base.cc b/ash/test/ash_test_base.cc
index 45996b2..5b92cd8 100644
--- a/ash/test/ash_test_base.cc
+++ b/ash/test/ash_test_base.cc
@@ -12,7 +12,7 @@
 #include "base/string_split.h"
 #include "content/public/test/web_contents_tester.h"
 #include "ui/aura/env.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/base/ime/text_input_test_support.h"
 #include "ui/compositor/layer_animator.h"
@@ -30,7 +30,7 @@ std::vector<gfx::Display> CreateDisplaysFromString(
   base::SplitString(specs, ',', &parts);
   for (std::vector<std::string>::const_iterator iter = parts.begin();
        iter != parts.end(); ++iter) {
-    displays.push_back(aura::DisplayManager::CreateDisplayFromSpec(*iter));
+    displays.push_back(aura::MonitorManager::CreateMonitorFromSpec(*iter));
   }
   return displays;
 }
@@ -72,20 +72,20 @@ void AshTestBase::TearDown() {
   ui::TextInputTestSupport::Shutdown();
 }
 
-void AshTestBase::ChangeDisplayConfig(float scale,
+void AshTestBase::ChangeMonitorConfig(float scale,
                                       const gfx::Rect& bounds_in_pixel) {
   gfx::Display display = gfx::Display(gfx::Screen::GetPrimaryDisplay().id());
   display.SetScaleAndBounds(scale, bounds_in_pixel);
   std::vector<gfx::Display> displays;
   displays.push_back(display);
-  aura::Env::GetInstance()->display_manager()->OnNativeDisplaysChanged(
+  aura::Env::GetInstance()->monitor_manager()->OnNativeMonitorsChanged(
       displays);
 }
 
-void AshTestBase::UpdateDisplay(const std::string& display_specs) {
+void AshTestBase::UpdateMonitor(const std::string& display_specs) {
   std::vector<gfx::Display> displays = CreateDisplaysFromString(display_specs);
-  aura::Env::GetInstance()->display_manager()->
-      OnNativeDisplaysChanged(displays);
+  aura::Env::GetInstance()->monitor_manager()->
+      OnNativeMonitorsChanged(displays);
 }
 
 void AshTestBase::RunAllPendingInMessageLoop() {
diff --git a/ash/test/ash_test_base.h b/ash/test/ash_test_base.h
index e26d2c3..559b370 100644
--- a/ash/test/ash_test_base.h
+++ b/ash/test/ash_test_base.h
@@ -36,16 +36,16 @@ class AshTestBase : public testing::Test {
   virtual void SetUp() OVERRIDE;
   virtual void TearDown() OVERRIDE;
 
-  // Change the primary display's configuration to use |bounds|
+  // Change the primary monitor's configuration to use |bounds|
   // and |scale|.
-  void ChangeDisplayConfig(float scale, const gfx::Rect& bounds);
+  void ChangeMonitorConfig(float scale, const gfx::Rect& bounds);
 
   // Update the display configuration as given in |display_specs|.  The
   // format of |display_spec| is a list of comma separated spec for
   // each displays. Please refer to the comment in
-  // | aura::DisplayManager::CreateDisplayFromSpec| for the format of
+  // | aura::MonitorManager::CreateMonitorFromSpec| for the format of
   // the display spec.
-  void UpdateDisplay(const std::string& display_specs);
+  void UpdateMonitor(const std::string& display_specs);
 
  protected:
   void RunAllPendingInMessageLoop();
diff --git a/ash/tooltips/tooltip_controller.cc b/ash/tooltips/tooltip_controller.cc
index 4798cd33..64ca6f0 100644
--- a/ash/tooltips/tooltip_controller.cc
+++ b/ash/tooltips/tooltip_controller.cc
@@ -66,9 +66,9 @@ gfx::Font GetDefaultFont() {
 int GetMaxWidth(int x, int y) {
   // TODO(varunjain): implementation duplicated in tooltip_manager_aura. Figure
   // out a way to merge.
-  gfx::Rect display_bounds =
+  gfx::Rect monitor_bounds =
       gfx::Screen::GetDisplayNearestPoint(gfx::Point(x, y)).bounds();
-  return (display_bounds.width() + 1) / 2;
+  return (monitor_bounds.width() + 1) / 2;
 }
 
 // Creates a widget of type TYPE_TOOLTIP
@@ -155,22 +155,22 @@ class TooltipController::Tooltip {
                            tooltip_height);
 
     tooltip_rect.Offset(kCursorOffsetX, kCursorOffsetY);
-    gfx::Rect display_bounds =
+    gfx::Rect monitor_bounds =
         gfx::Screen::GetDisplayNearestPoint(tooltip_rect.origin()).bounds();
 
     // If tooltip is out of bounds on the x axis, we simply shift it
     // horizontally by the offset.
-    if (tooltip_rect.right() > display_bounds.right()) {
-      int h_offset = tooltip_rect.right() - display_bounds.right();
+    if (tooltip_rect.right() > monitor_bounds.right()) {
+      int h_offset = tooltip_rect.right() - monitor_bounds.right();
       tooltip_rect.Offset(-h_offset, 0);
     }
 
     // If tooltip is out of bounds on the y axis, we flip it to appear above the
     // mouse cursor instead of below.
-    if (tooltip_rect.bottom() > display_bounds.bottom())
+    if (tooltip_rect.bottom() > monitor_bounds.bottom())
       tooltip_rect.set_y(mouse_pos.y() - tooltip_height);
 
-    widget_->SetBounds(tooltip_rect.AdjustToFit(display_bounds));
+    widget_->SetBounds(tooltip_rect.AdjustToFit(monitor_bounds));
   }
 
 };
diff --git a/ash/wm/base_layout_manager.cc b/ash/wm/base_layout_manager.cc
index 29d39a0d..4e39fff 100644
--- a/ash/wm/base_layout_manager.cc
+++ b/ash/wm/base_layout_manager.cc
@@ -120,7 +120,7 @@ void BaseLayoutManager::OnRootWindowResized(const aura::RootWindow* root,
 /////////////////////////////////////////////////////////////////////////////
 // BaseLayoutManager, ash::ShellObserver overrides:
 
-void BaseLayoutManager::OnDisplayWorkAreaInsetsChanged() {
+void BaseLayoutManager::OnMonitorWorkAreaInsetsChanged() {
   AdjustWindowSizesForScreenChange();
 }
 
@@ -222,8 +222,8 @@ void BaseLayoutManager::MaybeAnimateToBounds(aura::Window* window,
 }
 
 void BaseLayoutManager::AdjustWindowSizesForScreenChange() {
-  // If a user plugs an external display into a laptop running Aura the
-  // display size will change.  Maximized windows need to resize to match.
+  // If a user plugs an external monitor into a laptop running Aura the
+  // monitor size will change.  Maximized windows need to resize to match.
   // We also do this when developers running Aura on a desktop manually resize
   // the host window.
   // We also need to do this when the work area insets changes.
@@ -238,10 +238,10 @@ void BaseLayoutManager::AdjustWindowSizesForScreenChange() {
           window, gfx::Screen::GetDisplayNearestWindow(window).bounds());
     } else {
       // The work area may be smaller than the full screen.
-      gfx::Rect display_rect =
+      gfx::Rect monitor_rect =
           gfx::Screen::GetDisplayNearestWindow(window).work_area();
-      // Put as much of the window as possible within the display area.
-      window->SetBounds(window->bounds().AdjustToFit(display_rect));
+      // Put as much of the window as possible within the monitor area.
+      window->SetBounds(window->bounds().AdjustToFit(monitor_rect));
     }
   }
 }
diff --git a/ash/wm/base_layout_manager.h b/ash/wm/base_layout_manager.h
index 8ba5f5c..becf24a 100644
--- a/ash/wm/base_layout_manager.h
+++ b/ash/wm/base_layout_manager.h
@@ -57,7 +57,7 @@ class ASH_EXPORT BaseLayoutManager : public aura::LayoutManager,
                                    const gfx::Size& old_size) OVERRIDE;
 
   // ash::ShellObserver overrides:
-  virtual void OnDisplayWorkAreaInsetsChanged() OVERRIDE;
+  virtual void OnMonitorWorkAreaInsetsChanged() OVERRIDE;
 
   // WindowObserver overrides:
   virtual void OnWindowPropertyChanged(aura::Window* window,
diff --git a/ash/wm/base_layout_manager_unittest.cc b/ash/wm/base_layout_manager_unittest.cc
index 2de08af..626aa66 100644
--- a/ash/wm/base_layout_manager_unittest.cc
+++ b/ash/wm/base_layout_manager_unittest.cc
@@ -29,7 +29,7 @@ class BaseLayoutManagerTest : public test::AshTestBase {
 
   virtual void SetUp() OVERRIDE {
     test::AshTestBase::SetUp();
-    Shell::GetInstance()->SetDisplayWorkAreaInsets(
+    Shell::GetInstance()->SetMonitorWorkAreaInsets(
         Shell::GetPrimaryRootWindow(),
         gfx::Insets(1, 2, 3, 4));
     Shell::GetPrimaryRootWindow()->SetHostSize(gfx::Size(800, 600));
@@ -53,7 +53,7 @@ TEST_F(BaseLayoutManagerTest, Maximize) {
   gfx::Rect bounds(100, 100, 200, 200);
   scoped_ptr<aura::Window> window(CreateTestWindow(bounds));
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_MAXIMIZED);
-  // Maximized window fills the work area, not the whole display.
+  // Maximized window fills the work area, not the whole monitor.
   EXPECT_EQ(ScreenAsh::GetMaximizedWindowBounds(window.get()).ToString(),
             window->bounds().ToString());
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_NORMAL);
@@ -93,7 +93,7 @@ TEST_F(BaseLayoutManagerTest, Fullscreen) {
   gfx::Rect bounds(100, 100, 200, 200);
   scoped_ptr<aura::Window> window(CreateTestWindow(bounds));
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_FULLSCREEN);
-  // Fullscreen window fills the whole display.
+  // Fullscreen window fills the whole monitor.
   EXPECT_EQ(
       gfx::Screen::GetDisplayNearestWindow(window.get()).bounds().ToString(),
       window->bounds().ToString());
@@ -105,12 +105,12 @@ TEST_F(BaseLayoutManagerTest, Fullscreen) {
 TEST_F(BaseLayoutManagerTest, FullscreenRootWindowResize) {
   gfx::Rect bounds(100, 100, 200, 200);
   scoped_ptr<aura::Window> window(CreateTestWindow(bounds));
-  // Fullscreen window fills the whole display.
+  // Fullscreen window fills the whole monitor.
   window->SetProperty(aura::client::kShowStateKey, ui::SHOW_STATE_FULLSCREEN);
   EXPECT_EQ(
       gfx::Screen::GetDisplayNearestWindow(window.get()).bounds().ToString(),
       window->bounds().ToString());
-  // Enlarge the root window.  We should still match the display size.
+  // Enlarge the root window.  We should still match the monitor size.
   Shell::GetPrimaryRootWindow()->SetHostSize(gfx::Size(800, 600));
   EXPECT_EQ(
       gfx::Screen::GetDisplayNearestWindow(window.get()).bounds().ToString(),
diff --git a/ash/wm/frame_painter.cc b/ash/wm/frame_painter.cc
index 98e0007..617b22ea 100644
--- a/ash/wm/frame_painter.cc
+++ b/ash/wm/frame_painter.cc
@@ -376,8 +376,8 @@ void FramePainter::PaintHeader(views::NonClientFrameView* view,
 
   // We don't need the extra lightness in the edges when we're at the top edge
   // of the screen.
-  // TODO(oshima): This will not work under multi-display, need to add method
-  // like GetWindowBoundsInDisplay().
+  // TODO(oshima): This will not work under multi-monitor, need to add method
+  // like GetWindowBoundsInMonitor().
   if (frame_->GetWindowScreenBounds().y() == 0)
     return;
 
diff --git a/ash/wm/screen_dimmer.h b/ash/wm/screen_dimmer.h
index 46bed1f..daa60ea0 100644
--- a/ash/wm/screen_dimmer.h
+++ b/ash/wm/screen_dimmer.h
@@ -24,7 +24,7 @@ namespace ash {
 namespace internal {
 
 // ScreenDimmer displays a partially-opaque layer above everything
-// else in the root window to darken the display.  It shouldn't be used
+// else in the root window to darken the monitor.  It shouldn't be used
 // for long-term brightness adjustments due to performance
 // considerations -- it's only intended for cases where we want to
 // briefly dim the screen (e.g. to indicate to the user that we're
diff --git a/ash/wm/shelf_layout_manager.cc b/ash/wm/shelf_layout_manager.cc
index 156fad1..3c3246f 100644
--- a/ash/wm/shelf_layout_manager.cc
+++ b/ash/wm/shelf_layout_manager.cc
@@ -206,7 +206,7 @@ bool ShelfLayoutManager::SetAlignment(ShelfAlignment alignment) {
 }
 
 gfx::Rect ShelfLayoutManager::GetIdealBounds() {
-  // TODO: this is wrong. Figure out what display shelf is on and everything
+  // TODO: this is wrong. Figure out what monitor shelf is on and everything
   // should be based on it.
   gfx::Rect bounds(
       gfx::Screen::GetDisplayNearestWindow(status_->GetNativeView()).bounds());
@@ -239,7 +239,7 @@ void ShelfLayoutManager::LayoutShelf() {
   }
   GetLayer(status_)->SetOpacity(target_bounds.opacity);
   status_->SetBounds(target_bounds.status_bounds);
-  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+  Shell::GetInstance()->SetMonitorWorkAreaInsets(
       Shell::GetPrimaryRootWindow(),
       target_bounds.work_area_insets);
   UpdateHitTestBounds();
@@ -384,7 +384,7 @@ void ShelfLayoutManager::SetState(VisibilityState visibility_state) {
   status_animation_setter.SetTweenType(ui::Tween::EASE_OUT);
   GetLayer(status_)->SetBounds(target_bounds.status_bounds);
   GetLayer(status_)->SetOpacity(target_bounds.opacity);
-  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+  Shell::GetInstance()->SetMonitorWorkAreaInsets(
       Shell::GetPrimaryRootWindow(),
       target_bounds.work_area_insets);
   UpdateHitTestBounds();
diff --git a/ash/wm/shelf_layout_manager_unittest.cc b/ash/wm/shelf_layout_manager_unittest.cc
index 898cc2a..ff61d3f 100644
--- a/ash/wm/shelf_layout_manager_unittest.cc
+++ b/ash/wm/shelf_layout_manager_unittest.cc
@@ -14,7 +14,7 @@
 #include "ash/test/ash_test_base.h"
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/env.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/test/event_generator.h"
 #include "ui/aura/window.h"
@@ -92,8 +92,8 @@ TEST_F(ShelfLayoutManagerTest, MAYBE_SetVisible) {
   gfx::Rect launcher_bounds(shelf->launcher_widget()->GetWindowScreenBounds());
   int shelf_height = shelf->GetIdealBounds().height();
 
-  const aura::DisplayManager* manager =
-      aura::Env::GetInstance()->display_manager();
+  const aura::MonitorManager* manager =
+      aura::Env::GetInstance()->monitor_manager();
   const gfx::Display& display =
       manager->GetDisplayNearestWindow(Shell::GetPrimaryRootWindow());
   ASSERT_NE(-1, display.id());
@@ -144,8 +144,8 @@ TEST_F(ShelfLayoutManagerTest, LayoutShelfWhileAnimating) {
   shelf->LayoutShelf();
   EXPECT_EQ(ShelfLayoutManager::VISIBLE, shelf->visibility_state());
 
-  const aura::DisplayManager* manager =
-      aura::Env::GetInstance()->display_manager();
+  const aura::MonitorManager* manager =
+      aura::Env::GetInstance()->monitor_manager();
   const gfx::Display& display =
       manager->GetDisplayNearestWindow(Shell::GetPrimaryRootWindow());
 
@@ -326,25 +326,25 @@ TEST_F(ShelfLayoutManagerTest, SetAutoHideBehavior) {
   widget->Init(params);
   widget->Show();
   aura::Window* window = widget->GetNativeWindow();
-  gfx::Rect display_bounds(
+  gfx::Rect monitor_bounds(
       gfx::Screen::GetDisplayNearestWindow(window).bounds());
-  EXPECT_EQ(display_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
+  EXPECT_EQ(monitor_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
             shelf->GetMaximizedWindowBounds(window).bottom());
   EXPECT_EQ(ShelfLayoutManager::VISIBLE, shelf->visibility_state());
 
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_ALWAYS);
   EXPECT_EQ(ShelfLayoutManager::AUTO_HIDE, shelf->visibility_state());
-  EXPECT_EQ(display_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
+  EXPECT_EQ(monitor_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
             shelf->GetMaximizedWindowBounds(window).bottom());
 
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_DEFAULT);
   EXPECT_EQ(ShelfLayoutManager::VISIBLE, shelf->visibility_state());
-  EXPECT_EQ(display_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
+  EXPECT_EQ(monitor_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
             shelf->GetMaximizedWindowBounds(window).bottom());
 
   shelf->SetAutoHideBehavior(SHELF_AUTO_HIDE_BEHAVIOR_NEVER);
   EXPECT_EQ(ShelfLayoutManager::VISIBLE, shelf->visibility_state());
-  EXPECT_GT(display_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
+  EXPECT_GT(monitor_bounds.bottom() - ShelfLayoutManager::kAutoHideSize,
             shelf->GetMaximizedWindowBounds(window).bottom());
 
   widget->Maximize();
@@ -498,8 +498,8 @@ TEST_F(ShelfLayoutManagerTest, SetAlignment) {
   shelf->SetAlignment(SHELF_ALIGNMENT_LEFT);
 
   gfx::Rect launcher_bounds(shelf->launcher_widget()->GetWindowScreenBounds());
-  const aura::DisplayManager* manager =
-      aura::Env::GetInstance()->display_manager();
+  const aura::MonitorManager* manager =
+      aura::Env::GetInstance()->monitor_manager();
   gfx::Display display =
       manager->GetDisplayNearestWindow(Shell::GetPrimaryRootWindow());
   ASSERT_NE(-1, display.id());
diff --git a/ash/wm/stacking_controller.cc b/ash/wm/stacking_controller.cc
index 6d44525..368c9b5 100644
--- a/ash/wm/stacking_controller.cc
+++ b/ash/wm/stacking_controller.cc
@@ -4,7 +4,7 @@
 
 #include "ash/wm/stacking_controller.h"
 
-#include "ash/display/display_controller.h"
+#include "ash/monitor/monitor_controller.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
 #include "ash/wm/always_on_top_controller.h"
@@ -23,7 +23,7 @@ namespace {
 // that matches the window's bound will be used. Otherwise, it'll
 // return the active root window.
 aura::RootWindow* FindContainerRoot(const gfx::Rect& bounds) {
-  if (!DisplayController::IsVirtualScreenCoordinatesEnabled() ||
+  if (!MonitorController::IsVirtualScreenCoordinatesEnabled() ||
       (bounds.origin().x() == 0 && bounds.origin().y() == 0
        && bounds.IsEmpty())) {
     return Shell::GetActiveRootWindow();
diff --git a/ash/wm/toplevel_window_event_filter_unittest.cc b/ash/wm/toplevel_window_event_filter_unittest.cc
index ca9aeeb..fc8984b 100644
--- a/ash/wm/toplevel_window_event_filter_unittest.cc
+++ b/ash/wm/toplevel_window_event_filter_unittest.cc
@@ -402,7 +402,7 @@ TEST_F(ToplevelWindowEventFilterTest, DontDragToNegativeY) {
   EXPECT_EQ(100, target->bounds().height());
 }
 
-// Verifies we don't let windows go bigger than the display width.
+// Verifies we don't let windows go bigger than the monitor width.
 TEST_F(ToplevelWindowEventFilterTest, DontGotWiderThanScreen) {
   scoped_ptr<aura::Window> target(CreateWindow(HTRIGHT));
   gfx::Rect work_area =
diff --git a/ash/wm/window_resizer.cc b/ash/wm/window_resizer.cc
index df28ec7..7e62d23 100644
--- a/ash/wm/window_resizer.cc
+++ b/ash/wm/window_resizer.cc
@@ -292,7 +292,7 @@ int WindowResizer::GetWidthForDrag(const Details& details,
       *delta_x = -x_multiplier * (details.initial_bounds.width() - min_width);
     }
 
-    // And don't let the window go bigger than the display.
+    // And don't let the window go bigger than the monitor.
     int max_width =
         gfx::Screen::GetDisplayNearestWindow(details.window).bounds().width();
     if (width > max_width) {
@@ -326,7 +326,7 @@ int WindowResizer::GetHeightForDrag(const Details& details,
       *delta_y = -y_multiplier * (details.initial_bounds.height() - min_height);
     }
 
-    // And don't let the window go bigger than the display.
+    // And don't let the window go bigger than the monitor.
     int max_height =
         gfx::Screen::GetDisplayNearestWindow(details.window).bounds().height();
     if (height > max_height) {
diff --git a/ash/wm/window_util.h b/ash/wm/window_util.h
index 2f611b8..e0bd718 100644
--- a/ash/wm/window_util.h
+++ b/ash/wm/window_util.h
@@ -56,7 +56,7 @@ ASH_EXPORT void MinimizeWindow(aura::Window* window);
 // Restores |window|, which must not be NULL.
 ASH_EXPORT void RestoreWindow(aura::Window* window);
 
-// Moves the window to the center of the display.
+// Moves the window to the center of the monitor.
 ASH_EXPORT void CenterWindow(aura::Window* window);
 
 }  // namespace wm
diff --git a/ash/wm/workspace/snap_sizer.cc b/ash/wm/workspace/snap_sizer.cc
index c303f1d..092ba697 100644
--- a/ash/wm/workspace/snap_sizer.cc
+++ b/ash/wm/workspace/snap_sizer.cc
@@ -129,7 +129,7 @@ gfx::Rect SnapSizer::GetTargetBoundsForPercent(int percent_index) const {
 }
 
 bool SnapSizer::AlongEdge(int x) const {
-  // TODO: need to support multi-display.
+  // TODO: need to support multi-monitor.
   gfx::Rect area(gfx::Screen::GetDisplayNearestWindow(window_).bounds());
   return (x <= area.x()) || (x >= area.right() - 1);
 }
diff --git a/ash/wm/workspace/workspace_manager.cc b/ash/wm/workspace/workspace_manager.cc
index 016244a..1eccfe6 100644
--- a/ash/wm/workspace/workspace_manager.cc
+++ b/ash/wm/workspace/workspace_manager.cc
@@ -141,7 +141,7 @@ WorkspaceManager::WindowState WorkspaceManager::GetWindowState() {
   if (!shelf_ || !active_workspace_)
     return WINDOW_STATE_DEFAULT;
 
-  // TODO: this code needs to be made multi-display aware.
+  // TODO: this code needs to be made multi-monitor aware.
   gfx::Rect shelf_bounds(shelf_->GetIdealBounds());
   const aura::Window::Windows& windows(contents_view_->children());
   bool window_overlaps_launcher = false;
diff --git a/ash/wm/workspace/workspace_window_resizer.cc b/ash/wm/workspace/workspace_window_resizer.cc
index 26d957c..9b52030 100644
--- a/ash/wm/workspace/workspace_window_resizer.cc
+++ b/ash/wm/workspace/workspace_window_resizer.cc
@@ -286,7 +286,7 @@ void WorkspaceWindowResizer::AdjustBoundsForMainWindow(
   if (bounds->y() > max_y)
     bounds->set_y(max_y);
 
-  // Don't allow dragging above the top of the display.
+  // Don't allow dragging above the top of the monitor.
   if (bounds->y() <= work_area.y())
     bounds->set_y(work_area.y());
 
@@ -419,8 +419,8 @@ void WorkspaceWindowResizer::RestackWindows() {
 
 WorkspaceWindowResizer::SnapType WorkspaceWindowResizer::GetSnapType(
     const gfx::Point& location) const {
-  // TODO: this likely only wants total display area, not the area of a single
-  // display.
+  // TODO: this likely only wants total monitor area, not the area of a single
+  // monitor.
   gfx::Rect area(
       gfx::Screen::GetDisplayNearestWindow(details_.window).bounds());
   if (location.x() <= area.x())
diff --git a/ash/wm/workspace/workspace_window_resizer_unittest.cc b/ash/wm/workspace/workspace_window_resizer_unittest.cc
index eed78ae..d3654c0 100644
--- a/ash/wm/workspace/workspace_window_resizer_unittest.cc
+++ b/ash/wm/workspace/workspace_window_resizer_unittest.cc
@@ -55,7 +55,7 @@ class WorkspaceWindowResizerTest : public test::AshTestBase {
 
     gfx::Rect root_bounds(root->bounds());
     EXPECT_EQ(kRootHeight, root_bounds.height());
-    Shell::GetInstance()->SetDisplayWorkAreaInsets(root, gfx::Insets());
+    Shell::GetInstance()->SetMonitorWorkAreaInsets(root, gfx::Insets());
     window_.reset(new aura::Window(&delegate_));
     window_->Init(ui::LAYER_NOT_DRAWN);
     window_->SetParent(root);
@@ -347,13 +347,13 @@ TEST_F(WorkspaceWindowResizerTest, AttachedResize_BOTTOM_2) {
 // Assertions around attached window resize dragging from the bottom with 3
 // windows.
 // TODO(oshima): Host window doesn't get a resize event after
-// SetHostSize on Windows trybot, which gives wrong work/display area.
+// SetHostSize on Windows trybot, which gives wrong work/monitor area.
 TEST_F(WorkspaceWindowResizerTest, AttachedResize_BOTTOM_3) {
   aura::RootWindow* root = Shell::GetPrimaryRootWindow();
   root->SetHostSize(gfx::Size(600, 800));
   LOG(ERROR) << "=== Calling OnHostResized, 600x800";
 
-  Shell::GetInstance()->SetDisplayWorkAreaInsets(root, gfx::Insets());
+  Shell::GetInstance()->SetMonitorWorkAreaInsets(root, gfx::Insets());
 
   window_->SetBounds(gfx::Rect( 300, 100, 300, 200));
   window2_->SetBounds(gfx::Rect(300, 300, 200, 150));
@@ -496,7 +496,7 @@ TEST_F(WorkspaceWindowResizerTest, RestackAttached) {
 
 // Makes sure we don't allow dragging below the work area.
 TEST_F(WorkspaceWindowResizerTest, DontDragOffBottom) {
-  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+  Shell::GetInstance()->SetMonitorWorkAreaInsets(
       Shell::GetPrimaryRootWindow(), gfx::Insets(0, 0, 10, 0));
 
   window_->SetBounds(gfx::Rect(100, 200, 300, 400));
@@ -513,7 +513,7 @@ TEST_F(WorkspaceWindowResizerTest, DontDragOffBottom) {
 
 // Makes sure we don't allow dragging off the top of the work area.
 TEST_F(WorkspaceWindowResizerTest, DontDragOffTop) {
-  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+  Shell::GetInstance()->SetMonitorWorkAreaInsets(
       Shell::GetPrimaryRootWindow(), gfx::Insets(10, 0, 0, 0));
 
   window_->SetBounds(gfx::Rect(100, 200, 300, 400));
@@ -526,7 +526,7 @@ TEST_F(WorkspaceWindowResizerTest, DontDragOffTop) {
 }
 
 TEST_F(WorkspaceWindowResizerTest, ResizeBottomOutsideWorkArea) {
-  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+  Shell::GetInstance()->SetMonitorWorkAreaInsets(
       Shell::GetPrimaryRootWindow(), gfx::Insets(0, 0, 50, 0));
 
   window_->SetBounds(gfx::Rect(100, 200, 300, 380));
@@ -595,7 +595,7 @@ TEST_F(WorkspaceWindowResizerTest, SnapToEdge) {
 // the work area.
 TEST_F(WorkspaceWindowResizerTest, TallWindow) {
   aura::RootWindow* root = Shell::GetPrimaryRootWindow();
-  Shell::GetInstance()->SetDisplayWorkAreaInsets(
+  Shell::GetInstance()->SetMonitorWorkAreaInsets(
       root, gfx::Insets(0, 0, 50, 0));
   window_->SetBounds(gfx::Rect(0, 0, 320, 560));
   SetGridSize(16);
diff --git a/chrome/browser/chromeos/power/output_observer.cc b/chrome/browser/chromeos/power/output_observer.cc
index 9b8c221..1896495 100644
--- a/chrome/browser/chromeos/power/output_observer.cc
+++ b/chrome/browser/chromeos/power/output_observer.cc
@@ -6,7 +6,7 @@
 
 #include "ash/shell.h"
 #include "chromeos/dbus/dbus_thread_manager.h"
-#include "chromeos/display/output_configurator.h"
+#include "chromeos/monitor/output_configurator.h"
 
 namespace chromeos {
 
diff --git a/chrome/browser/ui/ash/ash_init.cc b/chrome/browser/ui/ash/ash_init.cc
index 97f6f16..5bf0b0a 100644
--- a/chrome/browser/ui/ash/ash_init.cc
+++ b/chrome/browser/ui/ash/ash_init.cc
@@ -21,7 +21,7 @@
 #include "chrome/common/chrome_switches.h"
 #include "ui/aura/aura_switches.h"
 #include "ui/aura/env.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/compositor/compositor_setup.h"
 
@@ -54,7 +54,7 @@ void OpenAsh() {
 #endif
 
   if (use_fullscreen) {
-    aura::DisplayManager::set_use_fullscreen_host_window(true);
+    aura::MonitorManager::set_use_fullscreen_host_window(true);
 #if defined(OS_CHROMEOS)
     aura::RootWindow::set_hide_host_cursor(true);
     // Hide the mouse cursor completely at boot.
diff --git a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
index 3c9bea2..056271d 100644
--- a/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
+++ b/chrome/browser/ui/aura/chrome_browser_main_extra_parts_aura.cc
@@ -12,7 +12,7 @@
 #include "ui/aura/desktop/desktop_screen.h"
 #include "ui/aura/desktop/desktop_stacking_client.h"
 #include "ui/aura/env.h"
-#include "ui/aura/single_display_manager.h"
+#include "ui/aura/single_monitor_manager.h"
 #include "ui/gfx/screen.h"
 #include "ui/views/widget/native_widget_aura.h"
 #if defined(OS_LINUX)
@@ -30,7 +30,7 @@ ChromeBrowserMainExtraPartsAura::~ChromeBrowserMainExtraPartsAura() {
 void ChromeBrowserMainExtraPartsAura::PreProfileInit() {
 #if !defined(USE_ASH)
   gfx::Screen::SetInstance(aura::CreateDesktopScreen());
-  aura::Env::GetInstance()->SetDisplayManager(new aura::SingleDisplayManager);
+  aura::Env::GetInstance()->SetMonitorManager(new aura::SingleMonitorManager);
   stacking_client_.reset(new aura::DesktopStackingClient);
 #endif  // !USE_ASH
 
diff --git a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
index 61acf54..506a0ea 100644
--- a/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
+++ b/chrome/browser/ui/views/ash/chrome_browser_main_extra_parts_ash.cc
@@ -10,7 +10,7 @@
 #include "ui/aura/desktop/desktop_stacking_client.h"
 #include "ui/aura/desktop/desktop_screen.h"
 #include "ui/aura/env.h"
-#include "ui/aura/single_display_manager.h"
+#include "ui/aura/single_monitor_manager.h"
 #include "ui/gfx/screen.h"
 
 ChromeBrowserMainExtraPartsAsh::ChromeBrowserMainExtraPartsAsh() {
@@ -23,7 +23,7 @@ void ChromeBrowserMainExtraPartsAsh::PreProfileInit() {
   if (browser::ShouldOpenAshOnStartup()) {
     browser::OpenAsh();
   } else {
-    aura::Env::GetInstance()->SetDisplayManager(new aura::SingleDisplayManager);
+    aura::Env::GetInstance()->SetMonitorManager(new aura::SingleMonitorManager);
     stacking_client_.reset(new aura::DesktopStackingClient);
     gfx::Screen::SetInstance(aura::CreateDesktopScreen());
   }
diff --git a/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc b/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc
index d9bdd8c..835b742 100644
--- a/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc
+++ b/chrome/browser/ui/webui/options2/chromeos/display_options_handler.cc
@@ -6,16 +6,16 @@
 
 #include <string>
 
-#include "ash/display/display_controller.h"
+#include "ash/monitor/monitor_controller.h"
 #include "ash/shell.h"
 #include "base/logging.h"
 #include "base/json/json_value_converter.h"
 #include "base/values.h"
-#include "chromeos/display/output_configurator.h"
+#include "chromeos/monitor/output_configurator.h"
 #include "content/public/browser/web_ui.h"
 #include "grit/generated_resources.h"
 #include "ui/aura/env.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/base/l10n/l10n_util.h"
 #include "ui/gfx/display.h"
 #include "ui/gfx/rect.h"
@@ -23,14 +23,14 @@
 namespace chromeos {
 namespace options2 {
 
-using ash::internal::DisplayController;
+using ash::internal::MonitorController;
 
 DisplayOptionsHandler::DisplayOptionsHandler() {
-  aura::Env::GetInstance()->display_manager()->AddObserver(this);
+  aura::Env::GetInstance()->monitor_manager()->AddObserver(this);
 }
 
 DisplayOptionsHandler::~DisplayOptionsHandler() {
-  aura::Env::GetInstance()->display_manager()->RemoveObserver(this);
+  aura::Env::GetInstance()->monitor_manager()->RemoveObserver(this);
 }
 
 void DisplayOptionsHandler::GetLocalizedValues(
@@ -80,13 +80,13 @@ void DisplayOptionsHandler::OnDisplayRemoved(const gfx::Display& old_display) {
 }
 
 void DisplayOptionsHandler::UpdateDisplaySectionVisibility() {
-  aura::DisplayManager* display_manager =
-      aura::Env::GetInstance()->display_manager();
+  aura::MonitorManager* monitor_manager =
+      aura::Env::GetInstance()->monitor_manager();
   chromeos::State output_state =
       ash::Shell::GetInstance()->output_configurator()->output_state();
   base::FundamentalValue show_options(
-      DisplayController::IsExtendedDesktopEnabled() &&
-      display_manager->GetNumDisplays() > 1 &&
+      MonitorController::IsExtendedDesktopEnabled() &&
+      monitor_manager->GetNumDisplays() > 1 &&
       output_state != chromeos::STATE_INVALID &&
       output_state != chromeos::STATE_HEADLESS &&
       output_state != chromeos::STATE_SINGLE);
@@ -95,16 +95,16 @@ void DisplayOptionsHandler::UpdateDisplaySectionVisibility() {
 }
 
 void DisplayOptionsHandler::SendDisplayInfo() {
-  aura::DisplayManager* display_manager =
-      aura::Env::GetInstance()->display_manager();
+  aura::MonitorManager* monitor_manager =
+      aura::Env::GetInstance()->monitor_manager();
   chromeos::OutputConfigurator* output_configurator =
       ash::Shell::GetInstance()->output_configurator();
   base::FundamentalValue mirroring(
       output_configurator->output_state() == chromeos::STATE_DUAL_MIRROR);
 
   base::ListValue displays;
-  for (size_t i = 0; i < display_manager->GetNumDisplays(); ++i) {
-    const gfx::Display& display = display_manager->GetDisplayAt(i);
+  for (size_t i = 0; i < monitor_manager->GetNumDisplays(); ++i) {
+    const gfx::Display& display = monitor_manager->GetDisplayAt(i);
     const gfx::Rect& bounds = display.bounds();
     base::DictionaryValue* js_display = new base::DictionaryValue();
     js_display->SetDouble("id", display.id());
@@ -115,10 +115,10 @@ void DisplayOptionsHandler::SendDisplayInfo() {
     displays.Set(i, js_display);
   }
 
-  DisplayController* display_controller =
-      ash::Shell::GetInstance()->display_controller();
+  MonitorController* monitor_controller =
+      ash::Shell::GetInstance()->monitor_controller();
   base::FundamentalValue layout(static_cast<int>(
-      display_controller->secondary_display_layout()));
+      monitor_controller->secondary_display_layout()));
 
   web_ui()->CallJavascriptFunction(
       "options.DisplayOptions.setDisplayInfo",
@@ -148,11 +148,11 @@ void DisplayOptionsHandler::HandleDisplayLayout(const base::ListValue* args) {
     LOG(ERROR) << "Invalid parameter";
     return;
   }
-  DCHECK_LE(DisplayController::TOP, layout);
-  DCHECK_GE(DisplayController::LEFT, layout);
+  DCHECK_LE(MonitorController::TOP, layout);
+  DCHECK_GE(MonitorController::LEFT, layout);
 
-  ash::Shell::GetInstance()->display_controller()->SetSecondaryDisplayLayout(
-      static_cast<DisplayController::SecondaryDisplayLayout>(layout));
+  ash::Shell::GetInstance()->monitor_controller()->SetSecondaryDisplayLayout(
+      static_cast<MonitorController::SecondaryDisplayLayout>(layout));
   SendDisplayInfo();
 }
 
diff --git a/chromeos/chromeos.gyp b/chromeos/chromeos.gyp
index 9870c9e..dff9498 100644
--- a/chromeos/chromeos.gyp
+++ b/chromeos/chromeos.gyp
@@ -103,8 +103,8 @@
         'dbus/sms_client.h',
         'dbus/update_engine_client.cc',
         'dbus/update_engine_client.h',
-        'display/output_configurator.cc',
-        'display/output_configurator.h',
+        'monitor/output_configurator.cc',
+        'monitor/output_configurator.h',
         'network/network_sms_handler.cc',
         'network/network_sms_handler.h',
       ],
diff --git a/chromeos/display/DEPS b/chromeos/monitor/DEPS
index d6abdda..d6abdda 100644
--- a/chromeos/display/DEPS
+++ b/chromeos/monitor/DEPS
diff --git a/chromeos/display/output_configurator.cc b/chromeos/monitor/output_configurator.cc
index 4543a52..8e47f07 100644
--- a/chromeos/display/output_configurator.cc
+++ b/chromeos/monitor/output_configurator.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "chromeos/display/output_configurator.h"
+#include "chromeos/monitor/output_configurator.h"
 
 #include <X11/Xlib.h>
 #include <X11/extensions/dpms.h>
@@ -37,15 +37,15 @@ const float kPixelsToMmScale = kMmInInch / kDpi96;
 
 // The DPI threshold to detech high density screen.
 // Higher DPI than this will use device_scale_factor=2
-// Should be kept in sync with display_change_observer_x11.cc
+// Should be kept in sync with monitor_change_observer_x11.cc
 const unsigned int kHighDensityDIPThreshold = 160;
 
 // Prefixes for the built-in displays.
 const char kInternal_LVDS[] = "LVDS";
 const char kInternal_eDP[] = "eDP";
 
-// Gap between screens so cursor at bottom of active display doesn't partially
-// appear on top of inactive display. Higher numbers guard against larger
+// Gap between screens so cursor at bottom of active monitor doesn't partially
+// appear on top of inactive monitor. Higher numbers guard against larger
 // cursors, but also waste more memory. We will double this gap for screens
 // with a device_scale_factor of 2. While this gap will not guard against all
 // possible cursors in X, it should handle the ones we actually use. See
diff --git a/chromeos/display/output_configurator.h b/chromeos/monitor/output_configurator.h
index 2b6d2d4..b98bcb4 100644
--- a/chromeos/display/output_configurator.h
+++ b/chromeos/monitor/output_configurator.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
-#define CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
+#ifndef CHROMEOS_MONITOR_OUTPUT_CONFIGURATOR_H_
+#define CHROMEOS_MONITOR_OUTPUT_CONFIGURATOR_H_
 #pragma once
 
 #include "base/basictypes.h"
@@ -42,7 +42,7 @@ struct CachedOutputDescription {
   unsigned long mm_height;
 };
 
-// Used to describe the state of a multi-display configuration.
+// Used to describe the state of a multi-monitor configuration.
 enum State {
   STATE_INVALID,
   STATE_HEADLESS,
@@ -162,4 +162,4 @@ class CHROMEOS_EXPORT OutputConfigurator : public MessageLoop::Dispatcher {
 
 }  // namespace chromeos
 
-#endif  // CHROMEOS_DISPLAY_OUTPUT_CONFIGURATOR_H_
+#endif  // CHROMEOS_MONITOR_OUTPUT_CONFIGURATOR_H_
diff --git a/ui/aura/aura.gyp b/ui/aura/aura.gyp
index 8befbdd..ff85629 100644
--- a/ui/aura/aura.gyp
+++ b/ui/aura/aura.gyp
@@ -87,10 +87,10 @@
         'focus_manager.h',
         'layout_manager.cc',
         'layout_manager.h',
-        'display_change_observer_x11.cc',
-        'display_change_observer_x11.h',
-        'display_manager.cc',
-        'display_manager.h',
+        'monitor_change_observer_x11.cc',
+        'monitor_change_observer_x11.h',
+        'monitor_manager.cc',
+        'monitor_manager.h',
         'root_window_host.h',
         'root_window_host_linux.cc',
         'root_window_host_linux.h',
@@ -110,8 +110,8 @@
         'shared/input_method_event_filter.h',
         'shared/root_window_capture_client.cc',
         'shared/root_window_capture_client.h',
-        'single_display_manager.cc',
-        'single_display_manager.h',
+        'single_monitor_manager.cc',
+        'single_monitor_manager.h',
         'ui_controls_win.cc',
         'ui_controls_x11.cc',
         'window.cc',
diff --git a/ui/aura/bench/bench_main.cc b/ui/aura/bench/bench_main.cc
index be3465b..92a837e 100644
--- a/ui/aura/bench/bench_main.cc
+++ b/ui/aura/bench/bench_main.cc
@@ -14,7 +14,7 @@
 #include "ui/aura/env.h"
 #include "ui/aura/event.h"
 #include "ui/aura/root_window.h"
-#include "ui/aura/single_display_manager.h"
+#include "ui/aura/single_monitor_manager.h"
 #include "ui/aura/window.h"
 #include "ui/base/hit_test.h"
 #include "ui/base/resource/resource_bundle.h"
@@ -282,11 +282,11 @@ int main(int argc, char** argv) {
 
   MessageLoop message_loop(MessageLoop::TYPE_UI);
   ui::CompositorTestSupport::Initialize();
-  aura::SingleDisplayManager* manager = new aura::SingleDisplayManager;
+  aura::SingleMonitorManager* manager = new aura::SingleMonitorManager;
   manager->set_use_fullscreen_host_window(true);
-  aura::Env::GetInstance()->SetDisplayManager(manager);
+  aura::Env::GetInstance()->SetMonitorManager(manager);
   scoped_ptr<aura::RootWindow> root_window(
-      aura::DisplayManager::CreateRootWindowForPrimaryDisplay());
+      aura::MonitorManager::CreateRootWindowForPrimaryMonitor());
 
   // add layers
   ColoredLayer background(SK_ColorRED);
diff --git a/ui/aura/demo/demo_main.cc b/ui/aura/demo/demo_main.cc
index b1908e8..050acb0 100644
--- a/ui/aura/demo/demo_main.cc
+++ b/ui/aura/demo/demo_main.cc
@@ -12,7 +12,7 @@
 #include "ui/aura/env.h"
 #include "ui/aura/event.h"
 #include "ui/aura/root_window.h"
-#include "ui/aura/single_display_manager.h"
+#include "ui/aura/single_monitor_manager.h"
 #include "ui/aura/window.h"
 #include "ui/aura/window_delegate.h"
 #include "ui/base/hit_test.h"
@@ -120,9 +120,9 @@ int main(int argc, char** argv) {
   // Create the message-loop here before creating the root window.
   MessageLoop message_loop(MessageLoop::TYPE_UI);
   ui::CompositorTestSupport::Initialize();
-  aura::Env::GetInstance()->SetDisplayManager(new aura::SingleDisplayManager);
+  aura::Env::GetInstance()->SetMonitorManager(new aura::SingleMonitorManager);
   scoped_ptr<aura::RootWindow> root_window(
-      aura::DisplayManager::CreateRootWindowForPrimaryDisplay());
+      aura::MonitorManager::CreateRootWindowForPrimaryMonitor());
   scoped_ptr<DemoStackingClient> stacking_client(new DemoStackingClient(
       root_window.get()));
 
diff --git a/ui/aura/display_observer.h b/ui/aura/display_observer.h
index 0399ae6..282241d 100644
--- a/ui/aura/display_observer.h
+++ b/ui/aura/display_observer.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_AURA_DISPLAY_OBSERVER_H_
-#define UI_AURA_DISPLAY_OBSERVER_H_
+#ifndef UI_AURA_MONITOR_OBSERVER_H_
+#define UI_AURA_MONITOR_OBSERVER_H_
 #pragma once
 
 #include "ui/aura/aura_export.h"
@@ -20,7 +20,7 @@ class AURA_EXPORT DisplayObserver {
   // Called when the |display|'s bound has changed.
   virtual void OnDisplayBoundsChanged(const gfx::Display& display) = 0;
 
-  // Called when |new_display| has been added.
+  // Called when |new_monitor| has been added.
   virtual void OnDisplayAdded(const gfx::Display& new_display) = 0;
 
   // Called when |old_display| has been removed.
@@ -32,4 +32,4 @@ class AURA_EXPORT DisplayObserver {
 
 }  // namespace aura
 
-#endif  // UI_AURA_DISPLAY_OBSERVER_H_
+#endif  // UI_AURA_MONITOR_OBSERVER_H_
diff --git a/ui/aura/env.cc b/ui/aura/env.cc
index d65a318..18aac53 100644
--- a/ui/aura/env.cc
+++ b/ui/aura/env.cc
@@ -7,13 +7,13 @@
 #include "ui/aura/cursor_manager.h"
 #include "ui/aura/env_observer.h"
 #include "ui/aura/event_filter.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/aura/window.h"
 #include "ui/compositor/compositor.h"
 
 #if defined(USE_X11)
-#include "ui/aura/display_change_observer_x11.h"
+#include "ui/aura/monitor_change_observer_x11.h"
 #endif
 
 namespace aura {
@@ -57,11 +57,11 @@ void Env::RemoveObserver(EnvObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
-void Env::SetDisplayManager(DisplayManager* display_manager) {
-  display_manager_.reset(display_manager);
+void Env::SetMonitorManager(MonitorManager* monitor_manager) {
+  monitor_manager_.reset(monitor_manager);
 #if defined(USE_X11)
-  // Update the display manager with latest info.
-  display_change_observer_->NotifyDisplayChange();
+  // Update the monitor manager with latest info.
+  monitor_change_observer_->NotifyDisplayChange();
 #endif
 }
 
@@ -83,7 +83,7 @@ void Env::Init() {
   dispatcher_.reset(CreateDispatcher());
 #endif
 #if defined(USE_X11)
-  display_change_observer_.reset(new internal::DisplayChangeObserverX11);
+  monitor_change_observer_.reset(new internal::MonitorChangeObserverX11);
 #endif
   ui::Compositor::Initialize(false);
 }
diff --git a/ui/aura/env.h b/ui/aura/env.h
index bef9483..e8e787d8 100644
--- a/ui/aura/env.h
+++ b/ui/aura/env.h
@@ -17,11 +17,11 @@ namespace aura {
 class CursorManager;
 class EnvObserver;
 class EventFilter;
-class DisplayManager;
+class MonitorManager;
 class Window;
 
 namespace internal {
-class DisplayChangeObserverX11;
+class MonitorChangeObserverX11;
 }
 
 #if !defined(OS_MACOSX)
@@ -56,10 +56,10 @@ class AURA_EXPORT Env {
     stacking_client_ = stacking_client;
   }
 
-  // Gets/sets DisplayManager. The DisplayManager's ownership is
+  // Gets/sets MonitorManager. The MonitorManager's ownership is
   // transfered.
-  DisplayManager* display_manager() { return display_manager_.get(); }
-  void SetDisplayManager(DisplayManager* display_manager);
+  MonitorManager* monitor_manager() { return monitor_manager_.get(); }
+  void SetMonitorManager(MonitorManager* monitor_manager);
 
   // Env takes ownership of the EventFilter.
   EventFilter* event_filter() { return event_filter_.get(); }
@@ -92,12 +92,12 @@ class AURA_EXPORT Env {
   int mouse_button_flags_;
   bool is_touch_down_;
   client::StackingClient* stacking_client_;
-  scoped_ptr<DisplayManager> display_manager_;
+  scoped_ptr<MonitorManager> monitor_manager_;
   scoped_ptr<EventFilter> event_filter_;
   CursorManager cursor_manager_;
 
 #if defined(USE_X11)
-  scoped_ptr<internal::DisplayChangeObserverX11> display_change_observer_;
+  scoped_ptr<internal::MonitorChangeObserverX11> monitor_change_observer_;
 #endif
 
   DISALLOW_COPY_AND_ASSIGN(Env);
diff --git a/ui/aura/display_change_observer_x11.cc b/ui/aura/monitor_change_observer_x11.cc
index 85b4aec..5afe527 100644
--- a/ui/aura/display_change_observer_x11.cc
+++ b/ui/aura/monitor_change_observer_x11.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/aura/display_change_observer_x11.h"
+#include "ui/aura/monitor_change_observer_x11.h"
 
 #include <algorithm>
 #include <map>
@@ -14,7 +14,7 @@
 #include "base/message_pump_aurax11.h"
 #include "ui/aura/dispatcher_linux.h"
 #include "ui/aura/env.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/compositor/dip_util.h"
 #include "ui/gfx/display.h"
 
@@ -30,7 +30,7 @@ namespace {
 // please update the bug (crosbug.com/31628) first and make sure that the
 // driver will use the same value.
 // This value also has to be kept in sync with the value in
-// chromeos/display/output_configurator.cc. See crbug.com/130188
+// chromeos/monitor/output_configurator.cc. See crbug.com/130188
 const unsigned int kHighDensityDIPThreshold = 160;
 
 // 1 inch in mm.
@@ -51,7 +51,7 @@ bool CompareDisplayY(const gfx::Display& lhs, const gfx::Display& rhs) {
 
 }  // namespace
 
-DisplayChangeObserverX11::DisplayChangeObserverX11()
+MonitorChangeObserverX11::MonitorChangeObserverX11()
     : xdisplay_(base::MessagePumpAuraX11::GetDefaultXDisplay()),
       x_root_window_(DefaultRootWindow(xdisplay_)),
       xrandr_event_base_(0) {
@@ -61,21 +61,21 @@ DisplayChangeObserverX11::DisplayChangeObserverX11()
       AddDispatcherForRootWindow(this);
 }
 
-DisplayChangeObserverX11::~DisplayChangeObserverX11() {
+MonitorChangeObserverX11::~MonitorChangeObserverX11() {
   static_cast<DispatcherLinux*>(Env::GetInstance()->GetDispatcher())->
       RemoveDispatcherForRootWindow(this);
 }
 
-bool DisplayChangeObserverX11::Dispatch(const base::NativeEvent& event) {
+bool MonitorChangeObserverX11::Dispatch(const base::NativeEvent& event) {
   if (event->type - xrandr_event_base_ == RRScreenChangeNotify) {
     NotifyDisplayChange();
   }
   return true;
 }
 
-void DisplayChangeObserverX11::NotifyDisplayChange() {
-  if (!DisplayManager::use_fullscreen_host_window())
-    return;  // Use the default display that display manager determined.
+void MonitorChangeObserverX11::NotifyDisplayChange() {
+  if (!MonitorManager::use_fullscreen_host_window())
+    return;  // Use the default monitor that monitor manager determined.
 
   XRRScreenResources* screen_resources =
       XRRGetScreenResources(xdisplay_, x_root_window_);
@@ -106,10 +106,10 @@ void DisplayChangeObserverX11::NotifyDisplayChange() {
     }
     XRRModeInfo* mode = FindMode(screen_resources, crtc_info->mode);
     CHECK(mode);
-    // Mirrored displays have the same y coordinates.
+    // Mirrored monitors have the same y coordinates.
     if (y_coords.find(crtc_info->y) != y_coords.end())
       continue;
-    // TODO(oshima): Create unique ID for the display.
+    // TODO(oshima): Create unique ID for the monitor.
     displays.push_back(gfx::Display(
         0,
         gfx::Rect(crtc_info->x, crtc_info->y, mode->width, mode->height)));
@@ -141,7 +141,7 @@ void DisplayChangeObserverX11::NotifyDisplayChange() {
        iter != displays.end(); ++iter, ++id)
     (*iter).set_id(id);
 
-  Env::GetInstance()->display_manager()->OnNativeDisplaysChanged(displays);
+  Env::GetInstance()->monitor_manager()->OnNativeMonitorsChanged(displays);
 }
 
 }  // namespace internal
diff --git a/ui/aura/display_change_observer_x11.h b/ui/aura/monitor_change_observer_x11.h
index caf3be7..4160860 100644
--- a/ui/aura/display_change_observer_x11.h
+++ b/ui/aura/monitor_change_observer_x11.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_AURA_DISPLAY_CHANGE_OBSERVER_X11_H
-#define UI_AURA_DISPLAY_CHANGE_OBSERVER_X11_H
+#ifndef UI_AURA_MONITOR_CHANGE_OBSERVER_X11_H
+#define UI_AURA_MONITOR_CHANGE_OBSERVER_X11_H
 #pragma once
 
 #include <X11/Xlib.h>
@@ -17,18 +17,18 @@
 namespace aura {
 namespace internal {
 
-// An object that observes changes in display configuration and
-// update DisplayManagers.
-class DisplayChangeObserverX11 : public MessageLoop::Dispatcher {
+// An object that observes changes in monitor configuration and
+// update MonitorManagers.
+class MonitorChangeObserverX11 : public MessageLoop::Dispatcher {
  public:
-  DisplayChangeObserverX11();
-  virtual ~DisplayChangeObserverX11();
+  MonitorChangeObserverX11();
+  virtual ~MonitorChangeObserverX11();
 
   // Overridden from Dispatcher overrides:
   virtual bool Dispatch(const base::NativeEvent& xev) OVERRIDE;
 
   // Reads display configurations from the system and notifies
-  // |display_manager_| about the change.
+  // |monitor_manager_| about the change.
   void NotifyDisplayChange();
 
  private:
@@ -38,10 +38,10 @@ class DisplayChangeObserverX11 : public MessageLoop::Dispatcher {
 
   int xrandr_event_base_;
 
-  DISALLOW_COPY_AND_ASSIGN(DisplayChangeObserverX11);
+  DISALLOW_COPY_AND_ASSIGN(MonitorChangeObserverX11);
 };
 
 }  // namespace internal
 }  // namespace aura
 
-#endif  // UI_AURA_DISPLAY_CHANGE_OBSERVER_X11_H
+#endif  // UI_AURA_MONITOR_CHANGE_OBSERVER_X11_H
diff --git a/ui/aura/display_manager.cc b/ui/aura/monitor_manager.cc
index af1e848..aba7bcc 100644
--- a/ui/aura/display_manager.cc
+++ b/ui/aura/monitor_manager.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 
 #include <stdio.h>
 
@@ -16,7 +16,7 @@
 
 namespace aura {
 namespace {
-// Default bounds for a display.
+// Default bounds for a monitor.
 const int kDefaultHostWindowX = 200;
 const int kDefaultHostWindowY = 200;
 const int kDefaultHostWindowWidth = 1280;
@@ -24,11 +24,11 @@ const int kDefaultHostWindowHeight = 1024;
 }  // namespace
 
 // static
-bool DisplayManager::use_fullscreen_host_window_ = false;
+bool MonitorManager::use_fullscreen_host_window_ = false;
 
 // static
-gfx::Display DisplayManager::CreateDisplayFromSpec(const std::string& spec) {
-  static int synthesized_display_id = 1000;
+gfx::Display MonitorManager::CreateMonitorFromSpec(const std::string& spec) {
+  static int synthesized_monitor_id = 1000;
   gfx::Rect bounds(kDefaultHostWindowX, kDefaultHostWindowY,
                    kDefaultHostWindowWidth, kDefaultHostWindowHeight);
   int x = 0, y = 0, width, height;
@@ -41,46 +41,46 @@ gfx::Display DisplayManager::CreateDisplayFromSpec(const std::string& spec) {
   } else if (use_fullscreen_host_window_) {
     bounds = gfx::Rect(aura::RootWindowHost::GetNativeScreenSize());
   }
-  gfx::Display display(synthesized_display_id++);
+  gfx::Display display(synthesized_monitor_id++);
   display.SetScaleAndBounds(scale, bounds);
   DVLOG(1) << "Display bounds=" << bounds.ToString() << ", scale=" << scale;
   return display;
 }
 
 // static
-RootWindow* DisplayManager::CreateRootWindowForPrimaryDisplay() {
-  DisplayManager* manager = aura::Env::GetInstance()->display_manager();
+RootWindow* MonitorManager::CreateRootWindowForPrimaryMonitor() {
+  MonitorManager* manager = aura::Env::GetInstance()->monitor_manager();
   RootWindow* root =
-      manager->CreateRootWindowForDisplay(manager->GetDisplayAt(0));
+      manager->CreateRootWindowForMonitor(manager->GetDisplayAt(0));
   if (use_fullscreen_host_window_)
     root->ConfineCursorToWindow();
   return root;
 }
 
-DisplayManager::DisplayManager() {
+MonitorManager::MonitorManager() {
 }
 
-DisplayManager::~DisplayManager() {
+MonitorManager::~MonitorManager() {
 }
 
-void DisplayManager::AddObserver(DisplayObserver* observer) {
+void MonitorManager::AddObserver(DisplayObserver* observer) {
   observers_.AddObserver(observer);
 }
 
-void DisplayManager::RemoveObserver(DisplayObserver* observer) {
+void MonitorManager::RemoveObserver(DisplayObserver* observer) {
   observers_.RemoveObserver(observer);
 }
 
-void DisplayManager::NotifyBoundsChanged(const gfx::Display& display) {
+void MonitorManager::NotifyBoundsChanged(const gfx::Display& display) {
   FOR_EACH_OBSERVER(DisplayObserver, observers_,
                     OnDisplayBoundsChanged(display));
 }
 
-void DisplayManager::NotifyDisplayAdded(const gfx::Display& display) {
+void MonitorManager::NotifyDisplayAdded(const gfx::Display& display) {
   FOR_EACH_OBSERVER(DisplayObserver, observers_, OnDisplayAdded(display));
 }
 
-void DisplayManager::NotifyDisplayRemoved(const gfx::Display& display) {
+void MonitorManager::NotifyDisplayRemoved(const gfx::Display& display) {
   FOR_EACH_OBSERVER(DisplayObserver, observers_, OnDisplayRemoved(display));
 }
 
diff --git a/ui/aura/display_manager.h b/ui/aura/monitor_manager.h
index 1d889c4..40e6bbf 100644
--- a/ui/aura/display_manager.h
+++ b/ui/aura/monitor_manager.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_AURA_DISPLAY_MANAGER_H_
-#define UI_AURA_DISPLAY_MANAGER_H_
+#ifndef UI_AURA_MONITOR_MANAGER_H_
+#define UI_AURA_MONITOR_MANAGER_H_
 #pragma once
 
 #include <string>
@@ -24,11 +24,11 @@ class DisplayObserver;
 class RootWindow;
 class Window;
 
-// DisplayManager creates, deletes and updates Display objects when
-// display configuration changes, and notifies DisplayObservers about
+// MonitorManager creates, deletes and updates Monitor objects when
+// monitor configuration changes, and notifies DisplayObservers about
 // the change. This is owned by Env and its lifetime is longer than
 // any windows.
-class AURA_EXPORT DisplayManager {
+class AURA_EXPORT MonitorManager {
  public:
   static void set_use_fullscreen_host_window(bool use_fullscreen) {
     use_fullscreen_host_window_ = use_fullscreen;
@@ -37,34 +37,34 @@ class AURA_EXPORT DisplayManager {
     return use_fullscreen_host_window_;
   }
 
-  // Creates a display from string spec. 100+200-1440x800 creates display
+  // Creates a monitor from string spec. 100+200-1440x800 creates monitor
   // whose size is 1440x800 at the location (100, 200) in screen's coordinates.
   // The location can be omitted and be just "1440x800", which creates
-  // display at the origin of the screen. An empty string creates
-  // the display with default size.
+  // monitor at the origin of the screen. An empty string creates
+  // the monitor with default size.
   //  The device scale factor can be specified by "*", like "1280x780*2",
   // or will use the value of |gfx::Display::GetForcedDeviceScaleFactor()| if
   // --force-device-scale-factor is specified.
-  static gfx::Display CreateDisplayFromSpec(const std::string& spec);
+  static gfx::Display CreateMonitorFromSpec(const std::string& spec);
 
-  // A utility function to create a root window for primary display.
-  static RootWindow* CreateRootWindowForPrimaryDisplay();
+  // A utility function to create a root window for primary monitor.
+  static RootWindow* CreateRootWindowForPrimaryMonitor();
 
-  DisplayManager();
-  virtual ~DisplayManager();
+  MonitorManager();
+  virtual ~MonitorManager();
 
   // Adds/removes DisplayObservers.
   void AddObserver(DisplayObserver* observer);
   void RemoveObserver(DisplayObserver* observer);
 
-  // Called when display configuration has changed. The new display
-  // configurations is passed as a vector of Display object, which
-  // contains each display's new infomration.
-  virtual void OnNativeDisplaysChanged(
+  // Called when monitor configuration has changed. The new monitor
+  // configurations is passed as a vector of Monitor object, which
+  // contains each monitor's new infomration.
+  virtual void OnNativeMonitorsChanged(
       const std::vector<gfx::Display>& display) = 0;
 
-  // Create a root window for given |display|.
-  virtual RootWindow* CreateRootWindowForDisplay(
+  // Create a root window for given |monitor|.
+  virtual RootWindow* CreateRootWindowForMonitor(
       const gfx::Display& display) = 0;
 
   // Returns the display at |index|. The display at 0 is considered "primary".
@@ -76,7 +76,7 @@ class AURA_EXPORT DisplayManager {
   virtual const gfx::Display& GetDisplayNearestWindow(
       const Window* window) const = 0;
 
-  // Returns the display object nearest given |pint|.
+  // Returns the monitor object nearest given |pint|.
   virtual const gfx::Display& GetDisplayNearestPoint(
       const gfx::Point& point) const = 0;
 
@@ -88,14 +88,14 @@ class AURA_EXPORT DisplayManager {
 
  private:
   // If set before the RootWindow is created, the host window will cover the
-  // entire display.  Note that this can still be overridden via the
+  // entire monitor.  Note that this can still be overridden via the
   // switches::kAuraHostWindowSize flag.
   static bool use_fullscreen_host_window_;
 
   ObserverList<DisplayObserver> observers_;
-  DISALLOW_COPY_AND_ASSIGN(DisplayManager);
+  DISALLOW_COPY_AND_ASSIGN(MonitorManager);
 };
 
 }  // namespace aura
 
-#endif  // UI_AURA_DISPLAY_MANAGER_H_
+#endif  // UI_AURA_MONITOR_MANAGER_H_
diff --git a/ui/aura/root_window.cc b/ui/aura/root_window.cc
index 85a1247..6728fa4 100644
--- a/ui/aura/root_window.cc
+++ b/ui/aura/root_window.cc
@@ -19,7 +19,7 @@
 #include "ui/aura/event.h"
 #include "ui/aura/event_filter.h"
 #include "ui/aura/focus_manager.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window_host.h"
 #include "ui/aura/root_window_observer.h"
 #include "ui/aura/window.h"
@@ -64,9 +64,9 @@ void GetEventFiltersToNotify(Window* target, EventFilters* filters) {
     filters->push_back(Env::GetInstance()->event_filter());
 }
 
-float GetDeviceScaleFactorFromDisplay(const aura::Window* window) {
-  DisplayManager* display_manager = Env::GetInstance()->display_manager();
-  return display_manager->GetDisplayNearestWindow(window).device_scale_factor();
+float GetDeviceScaleFactorFromMonitor(const aura::Window* window) {
+  MonitorManager* monitor_manager = Env::GetInstance()->monitor_manager();
+  return monitor_manager->GetDisplayNearestWindow(window).device_scale_factor();
 }
 
 Window* ConsumerToWindow(ui::GestureConsumer* consumer) {
@@ -154,7 +154,7 @@ RootWindow* RootWindow::GetForAcceleratedWidget(
 }
 
 void RootWindow::Init() {
-  compositor()->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(this),
+  compositor()->SetScaleAndSize(GetDeviceScaleFactorFromMonitor(this),
                                 host_->GetBounds().size());
   Window::Init(ui::LAYER_NOT_DRAWN);
   last_mouse_location_ =
@@ -390,8 +390,8 @@ bool RootWindow::DispatchGestureEvent(GestureEvent* event) {
 void RootWindow::OnHostResized(const gfx::Size& size_in_pixel) {
   DispatchHeldMouseMove();
   // The compositor should have the same size as the native root window host.
-  // Get the latest scale from display because it might have been changed.
-  compositor_->SetScaleAndSize(GetDeviceScaleFactorFromDisplay(this),
+  // Get the latest scale from monitor because it might have been changed.
+  compositor_->SetScaleAndSize(GetDeviceScaleFactorFromMonitor(this),
                                size_in_pixel);
   gfx::Size old(bounds().size());
   // The layer, and all the observers should be notified of the
diff --git a/ui/aura/single_display_manager.cc b/ui/aura/single_monitor_manager.cc
index 3ffc80b..e099341 100644
--- a/ui/aura/single_display_manager.cc
+++ b/ui/aura/single_monitor_manager.cc
@@ -2,7 +2,7 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#include "ui/aura/single_display_manager.h"
+#include "ui/aura/single_monitor_manager.h"
 
 #include <string>
 
@@ -18,24 +18,24 @@ namespace aura {
 using std::string;
 
 namespace {
-// Default bounds for the primary display.
+// Default bounds for the primary monitor.
 const int kDefaultHostWindowX = 200;
 const int kDefaultHostWindowY = 200;
 const int kDefaultHostWindowWidth = 1280;
 const int kDefaultHostWindowHeight = 1024;
 }  // namespace
 
-SingleDisplayManager::SingleDisplayManager()
+SingleMonitorManager::SingleMonitorManager()
     : root_window_(NULL) {
   Init();
 }
 
-SingleDisplayManager::~SingleDisplayManager() {
-  // All displays must have been deleted when display manager is deleted.
+SingleMonitorManager::~SingleMonitorManager() {
+  // All monitors must have been deleted when monitor manager is deleted.
   CHECK(!root_window_);
 }
 
-void SingleDisplayManager::OnNativeDisplaysChanged(
+void SingleMonitorManager::OnNativeMonitorsChanged(
     const std::vector<gfx::Display>& displays) {
   DCHECK(displays.size() > 0);
   if (use_fullscreen_host_window()) {
@@ -44,7 +44,7 @@ void SingleDisplayManager::OnNativeDisplaysChanged(
   }
 }
 
-RootWindow* SingleDisplayManager::CreateRootWindowForDisplay(
+RootWindow* SingleMonitorManager::CreateRootWindowForMonitor(
     const gfx::Display& display) {
   DCHECK(!root_window_);
   DCHECK_EQ(display_.id(), display.id());
@@ -54,25 +54,25 @@ RootWindow* SingleDisplayManager::CreateRootWindowForDisplay(
   return root_window_;
 }
 
-const gfx::Display& SingleDisplayManager::GetDisplayAt(size_t index) {
+const gfx::Display& SingleMonitorManager::GetDisplayAt(size_t index) {
   return display_;
 }
 
-size_t SingleDisplayManager::GetNumDisplays() const {
+size_t SingleMonitorManager::GetNumDisplays() const {
   return 1;
 }
 
-const gfx::Display& SingleDisplayManager::GetDisplayNearestWindow(
+const gfx::Display& SingleMonitorManager::GetDisplayNearestWindow(
     const Window* window) const {
   return display_;
 }
 
-const gfx::Display& SingleDisplayManager::GetDisplayNearestPoint(
+const gfx::Display& SingleMonitorManager::GetDisplayNearestPoint(
     const gfx::Point& point) const {
   return display_;
 }
 
-void SingleDisplayManager::OnWindowBoundsChanged(
+void SingleMonitorManager::OnWindowBoundsChanged(
     Window* window, const gfx::Rect& old_bounds, const gfx::Rect& new_bounds) {
   if (!use_fullscreen_host_window()) {
     Update(new_bounds.size());
@@ -80,18 +80,18 @@ void SingleDisplayManager::OnWindowBoundsChanged(
   }
 }
 
-void SingleDisplayManager::OnWindowDestroying(Window* window) {
+void SingleMonitorManager::OnWindowDestroying(Window* window) {
   if (root_window_ == window)
     root_window_ = NULL;
 }
 
-void SingleDisplayManager::Init() {
+void SingleMonitorManager::Init() {
   const string size_str = CommandLine::ForCurrentProcess()->GetSwitchValueASCII(
       switches::kAuraHostWindowSize);
-  display_ = CreateDisplayFromSpec(size_str);
+  display_ = CreateMonitorFromSpec(size_str);
 }
 
-void SingleDisplayManager::Update(const gfx::Size size) {
+void SingleMonitorManager::Update(const gfx::Size size) {
   display_.SetSize(size);
 }
 
diff --git a/ui/aura/single_display_manager.h b/ui/aura/single_monitor_manager.h
index d7b8265..46ef34c 100644
--- a/ui/aura/single_display_manager.h
+++ b/ui/aura/single_monitor_manager.h
@@ -2,13 +2,13 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_AURA_SINGLE_DISPLAY_MANAGER_H_
-#define UI_AURA_SINGLE_DISPLAY_MANAGER_H_
+#ifndef UI_AURA_SINGLE_MONITOR_MANAGER_H_
+#define UI_AURA_SINGLE_MONITOR_MANAGER_H_
 #pragma once
 
 #include "base/compiler_specific.h"
 #include "ui/aura/aura_export.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/window_observer.h"
 #include "ui/gfx/display.h"
 
@@ -18,17 +18,17 @@ class Rect;
 
 namespace aura {
 
-// A display manager assuming there is one display.
-class AURA_EXPORT SingleDisplayManager : public DisplayManager,
+// A monitor manager assuming there is one monitor.
+class AURA_EXPORT SingleMonitorManager : public MonitorManager,
                                          public WindowObserver {
  public:
-  SingleDisplayManager();
-  virtual ~SingleDisplayManager();
+  SingleMonitorManager();
+  virtual ~SingleMonitorManager();
 
-  // DisplayManager overrides:
-  virtual void OnNativeDisplaysChanged(
+  // MonitorManager overrides:
+  virtual void OnNativeMonitorsChanged(
       const std::vector<gfx::Display>& display) OVERRIDE;
-  virtual RootWindow* CreateRootWindowForDisplay(
+  virtual RootWindow* CreateRootWindowForMonitor(
       const gfx::Display& display) OVERRIDE;
   virtual const gfx::Display& GetDisplayAt(size_t index) OVERRIDE;
 
@@ -52,9 +52,9 @@ class AURA_EXPORT SingleDisplayManager : public DisplayManager,
   RootWindow* root_window_;
   gfx::Display display_;
 
-  DISALLOW_COPY_AND_ASSIGN(SingleDisplayManager);
+  DISALLOW_COPY_AND_ASSIGN(SingleMonitorManager);
 };
 
 }  // namespace aura
 
-#endif  // UI_AURA_SINGLE_DISPLAY_MANAGER_H_
+#endif  // UI_AURA_SINGLE_MONITOR_MANAGER_H_
diff --git a/ui/aura/test/aura_test_helper.cc b/ui/aura/test/aura_test_helper.cc
index 1dabfd4..c8549ba 100644
--- a/ui/aura/test/aura_test_helper.cc
+++ b/ui/aura/test/aura_test_helper.cc
@@ -8,10 +8,10 @@
 #include "ui/aura/client/aura_constants.h"
 #include "ui/aura/env.h"
 #include "ui/aura/focus_manager.h"
-#include "ui/aura/display_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window.h"
 #include "ui/aura/shared/root_window_capture_client.h"
-#include "ui/aura/single_display_manager.h"
+#include "ui/aura/single_monitor_manager.h"
 #include "ui/aura/test/test_activation_client.h"
 #include "ui/aura/test/test_screen.h"
 #include "ui/aura/test/test_stacking_client.h"
@@ -43,8 +43,8 @@ AuraTestHelper::~AuraTestHelper() {
 
 void AuraTestHelper::SetUp() {
   setup_called_ = true;
-  Env::GetInstance()->SetDisplayManager(new SingleDisplayManager);
-  root_window_.reset(aura::DisplayManager::CreateRootWindowForPrimaryDisplay());
+  Env::GetInstance()->SetMonitorManager(new SingleMonitorManager);
+  root_window_.reset(aura::MonitorManager::CreateRootWindowForPrimaryMonitor());
   gfx::Screen::SetInstance(new aura::TestScreen(root_window_.get()));
   ui_controls::InstallUIControlsAura(CreateUIControlsAura(root_window_.get()));
 
diff --git a/ui/aura/window.cc b/ui/aura/window.cc
index 40a70ef..d775c62 100644
--- a/ui/aura/window.cc
+++ b/ui/aura/window.cc
@@ -237,7 +237,7 @@ bool Window::IsVisible() const {
 
 gfx::Rect Window::GetBoundsInRootWindow() const {
   // TODO(beng): There may be a better way to handle this, and the existing code
-  //             is likely wrong anyway in a multi-display world, but this will
+  //             is likely wrong anyway in a multi-monitor world, but this will
   //             do for now.
   if (!GetRootWindow())
     return bounds();
diff --git a/ui/aura/window.h b/ui/aura/window.h
index 2c76082..cebedf8 100644
--- a/ui/aura/window.h
+++ b/ui/aura/window.h
@@ -135,7 +135,7 @@ class AURA_EXPORT Window : public ui::LayerDelegate,
   // Returns the window's bounds in screen coordinates. In ash, this is
   // effectively screen bounds.
   //
-  // TODO(oshima): Fix this to return screen's coordinate for multi-display
+  // TODO(oshima): Fix this to return screen's coordinate for multi-monitor
   // support.
   gfx::Rect GetBoundsInRootWindow() const;
 
diff --git a/ui/views/widget/native_widget_aura_unittest.cc b/ui/views/widget/native_widget_aura_unittest.cc
index cef5a85..87672ad 100644
--- a/ui/views/widget/native_widget_aura_unittest.cc
+++ b/ui/views/widget/native_widget_aura_unittest.cc
@@ -13,7 +13,9 @@
 #include "ui/aura/env.h"
 #include "ui/aura/event.h"
 #include "ui/aura/layout_manager.h"
+#include "ui/aura/monitor_manager.h"
 #include "ui/aura/root_window.h"
+#include "ui/aura/single_monitor_manager.h"
 #include "ui/aura/test/aura_test_helper.h"
 #include "ui/aura/window.h"
 #include "ui/gfx/screen.h"