Extract MonitorInfoProvider from WindowSizer.

And move the functionality into gfx::Screen.

BUG=101507
R=ben@chromium.org

Review URL: http://codereview.chromium.org/8549008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@113531 0039d316-1c4b-4281-b951-d872f2087c98

19 files changed, 257 insertions, 396 deletions

diff --git a/chrome/browser/chromeos/notifications/balloon_collection_impl.cc b/chrome/browser/chromeos/notifications/balloon_collection_impl.cc
index b5d3835..eb8d8aa 100644
--- a/chrome/browser/chromeos/notifications/balloon_collection_impl.cc
+++ b/chrome/browser/chromeos/notifications/balloon_collection_impl.cc
@@ -12,7 +12,6 @@
 #include "chrome/browser/notifications/balloon.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/ui/browser_list.h"
-#include "chrome/browser/ui/window_sizer.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_service.h"
 #include "ui/gfx/rect.h"
diff --git a/chrome/browser/notifications/balloon_collection_impl.cc b/chrome/browser/notifications/balloon_collection_impl.cc
index 173c78c..7494c7e 100644
--- a/chrome/browser/notifications/balloon_collection_impl.cc
+++ b/chrome/browser/notifications/balloon_collection_impl.cc
@@ -11,13 +11,13 @@
 #include "chrome/browser/notifications/balloon_host.h"
 #include "chrome/browser/notifications/notification.h"
 #include "chrome/browser/ui/browser.h"
-#include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/browser/ui/panels/panel.h"
-#include "chrome/browser/ui/window_sizer.h"
+#include "chrome/browser/ui/panels/panel_manager.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_registrar.h"
 #include "content/public/browser/notification_service.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/screen.h"
 #include "ui/gfx/size.h"
 
 namespace {
@@ -465,9 +465,7 @@ bool BalloonCollectionImpl::Layout::RefreshSystemMetrics() {
 #if defined(OS_MACOSX)
   gfx::Rect new_work_area = GetMacWorkArea();
 #else
-  scoped_ptr<WindowSizer::MonitorInfoProvider> info_provider(
-      WindowSizer::CreateDefaultMonitorInfoProvider());
-  gfx::Rect new_work_area = info_provider->GetPrimaryMonitorWorkArea();
+  gfx::Rect new_work_area = gfx::Screen::GetPrimaryMonitorWorkArea();
 #endif
   if (!work_area_.Equals(new_work_area)) {
     work_area_.SetRect(new_work_area.x(), new_work_area.y(),
diff --git a/chrome/browser/pdf_browsertest.cc b/chrome/browser/pdf_browsertest.cc
index 82980fc..cd535ad 100644
--- a/chrome/browser/pdf_browsertest.cc
+++ b/chrome/browser/pdf_browsertest.cc
@@ -10,7 +10,6 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
-#include "chrome/browser/ui/window_sizer.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_paths.h"
 #include "chrome/test/base/in_process_browser_test.h"
@@ -21,6 +20,7 @@
 #include "net/test/test_server.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/gfx/codec/png_codec.h"
+#include "ui/gfx/screen.h"
 
 namespace {
 
@@ -62,9 +62,7 @@ class PDFBrowserTest : public InProcessBrowserTest,
     // to a smaller window and then expanding leads to slight anti-aliasing
     // differences of the text and the pixel comparison fails.
     gfx::Rect bounds(gfx::Rect(0, 0, kBrowserWidth, kBrowserHeight));
-    scoped_ptr<WindowSizer::MonitorInfoProvider> monitor_info(
-        WindowSizer::CreateDefaultMonitorInfoProvider());
-    gfx::Rect screen_bounds = monitor_info->GetPrimaryMonitorBounds();
+    gfx::Rect screen_bounds = gfx::Screen::GetPrimaryMonitorBounds();
     ASSERT_GT(screen_bounds.width(), kBrowserWidth);
     ASSERT_GT(screen_bounds.height(), kBrowserHeight);
     browser()->window()->SetBounds(bounds);
diff --git a/chrome/browser/ui/gtk/browser_window_gtk.cc b/chrome/browser/ui/gtk/browser_window_gtk.cc
index 2ecbc30..82822d8 100644
--- a/chrome/browser/ui/gtk/browser_window_gtk.cc
+++ b/chrome/browser/ui/gtk/browser_window_gtk.cc
@@ -41,8 +41,8 @@
 #include "chrome/browser/ui/find_bar/find_tab_helper.h"
 #include "chrome/browser/ui/gtk/about_chrome_dialog.h"
 #include "chrome/browser/ui/gtk/accelerators_gtk.h"
-#include "chrome/browser/ui/gtk/avatar_menu_button_gtk.h"
 #include "chrome/browser/ui/gtk/avatar_menu_bubble_gtk.h"
+#include "chrome/browser/ui/gtk/avatar_menu_button_gtk.h"
 #include "chrome/browser/ui/gtk/bookmarks/bookmark_bar_gtk.h"
 #include "chrome/browser/ui/gtk/browser_titlebar.h"
 #include "chrome/browser/ui/gtk/browser_toolbar_gtk.h"
@@ -72,7 +72,6 @@
 #include "chrome/browser/ui/page_info_bubble.h"
 #include "chrome/browser/ui/tab_contents/tab_contents_wrapper.h"
 #include "chrome/browser/ui/webui/task_manager_dialog.h"
-#include "chrome/browser/ui/window_sizer.h"
 #include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_switches.h"
@@ -82,8 +81,8 @@
 #include "content/browser/renderer_host/render_widget_host_view.h"
 #include "content/browser/tab_contents/tab_contents.h"
 #include "content/browser/tab_contents/tab_contents_view.h"
-#include "content/public/browser/notification_service.h"
 #include "content/public/browser/native_web_keyboard_event.h"
+#include "content/public/browser/notification_service.h"
 #include "grit/chromium_strings.h"
 #include "grit/generated_resources.h"
 #include "grit/theme_resources.h"
@@ -97,6 +96,7 @@
 #include "ui/gfx/gtk_util.h"
 #include "ui/gfx/image/cairo_cached_surface.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/screen.h"
 #include "ui/gfx/skia_utils_gtk.h"
 
 namespace {
@@ -1960,10 +1960,8 @@ void BrowserWindowGtk::SaveWindowPosition() {
   window_preferences->SetInteger("bottom", restored_bounds_.bottom());
   window_preferences->SetBoolean("maximized", IsMaximized());
 
-  scoped_ptr<WindowSizer::MonitorInfoProvider> monitor_info_provider(
-      WindowSizer::CreateDefaultMonitorInfoProvider());
   gfx::Rect work_area(
-      monitor_info_provider->GetMonitorWorkAreaMatching(restored_bounds_));
+      gfx::Screen::GetMonitorWorkAreaMatching(restored_bounds_));
   window_preferences->SetInteger("work_area_left", work_area.x());
   window_preferences->SetInteger("work_area_top", work_area.y());
   window_preferences->SetInteger("work_area_right", work_area.right());
diff --git a/chrome/browser/ui/panels/panel_manager.cc b/chrome/browser/ui/panels/panel_manager.cc
index 30eb6cd..4f5dc1e 100644
--- a/chrome/browser/ui/panels/panel_manager.cc
+++ b/chrome/browser/ui/panels/panel_manager.cc
@@ -12,10 +12,10 @@
 #include "chrome/browser/ui/panels/panel_mouse_watcher.h"
 #include "chrome/browser/ui/panels/panel_overflow_strip.h"
 #include "chrome/browser/ui/panels/panel_strip.h"
-#include "chrome/browser/ui/window_sizer.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/public/browser/notification_service.h"
 #include "content/public/browser/notification_source.h"
+#include "ui/gfx/screen.h"
 
 namespace {
 const int kOverflowStripThickness = 24;
@@ -51,14 +51,12 @@ PanelManager::~PanelManager() {
 }
 
 void PanelManager::OnDisplayChanged() {
-  scoped_ptr<WindowSizer::MonitorInfoProvider> info_provider(
-      WindowSizer::CreateDefaultMonitorInfoProvider());
 #if defined(OS_MACOSX)
   // On OSX, panels should be dropped all the way to the bottom edge of the
   // screen (and overlap Dock).
-  gfx::Rect work_area = info_provider->GetPrimaryMonitorBounds();
+  gfx::Rect work_area = gfx::Screen::GetPrimaryMonitorBounds();
 #else
-  gfx::Rect work_area = info_provider->GetPrimaryMonitorWorkArea();
+  gfx::Rect work_area = gfx::Screen::GetPrimaryMonitorWorkArea();
 #endif
   SetWorkArea(work_area);
 }
diff --git a/chrome/browser/ui/views/chrome_views_delegate.cc b/chrome/browser/ui/views/chrome_views_delegate.cc
index 250bc9e..ac0f073 100644
--- a/chrome/browser/ui/views/chrome_views_delegate.cc
+++ b/chrome/browser/ui/views/chrome_views_delegate.cc
@@ -13,10 +13,10 @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/views/accessibility_event_router_views.h"
 #include "chrome/browser/ui/views/event_utils.h"
-#include "chrome/browser/ui/window_sizer.h"
 #include "chrome/common/pref_names.h"
 #include "ui/base/clipboard/clipboard.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/screen.h"
 #include "ui/views/widget/native_widget.h"
 #include "ui/views/widget/widget.h"
 
@@ -69,10 +69,7 @@ void ChromeViewsDelegate::SaveWindowPlacement(const views::Widget* window,
   window_preferences->SetBoolean("maximized",
                                  show_state == ui::SHOW_STATE_MAXIMIZED);
 
-  scoped_ptr<WindowSizer::MonitorInfoProvider> monitor_info_provider(
-      WindowSizer::CreateDefaultMonitorInfoProvider());
-  gfx::Rect work_area(
-      monitor_info_provider->GetMonitorWorkAreaMatching(bounds));
+  gfx::Rect work_area(gfx::Screen::GetMonitorWorkAreaMatching(bounds));
   window_preferences->SetInteger("work_area_left", work_area.x());
   window_preferences->SetInteger("work_area_top", work_area.y());
   window_preferences->SetInteger("work_area_right", work_area.right());
diff --git a/chrome/browser/ui/views/constrained_window_views.cc b/chrome/browser/ui/views/constrained_window_views.cc
index c864452..c5eef5e 100644
--- a/chrome/browser/ui/views/constrained_window_views.cc
+++ b/chrome/browser/ui/views/constrained_window_views.cc
@@ -14,7 +14,6 @@
 #include "chrome/browser/ui/toolbar/toolbar_model.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/views/tab_contents/tab_contents_view_views.h"
-#include "chrome/browser/ui/window_sizer.h"
 #include "chrome/common/chrome_constants.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "content/browser/tab_contents/tab_contents.h"
@@ -31,6 +30,7 @@
 #include "ui/gfx/font.h"
 #include "ui/gfx/path.h"
 #include "ui/gfx/rect.h"
+#include "ui/gfx/screen.h"
 #include "ui/views/controls/button/image_button.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/views_delegate.h"
diff --git a/chrome/browser/ui/window_sizer.cc b/chrome/browser/ui/window_sizer.cc
index 228e4a1..58a6956 100644
--- a/chrome/browser/ui/window_sizer.cc
+++ b/chrome/browser/ui/window_sizer.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/ui/window_sizer.h"
 
+#include "base/compiler_specific.h"
 #include "chrome/browser/browser_process.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
@@ -11,6 +12,27 @@
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
 #include "chrome/common/pref_names.h"
+#include "ui/gfx/screen.h"
+
+// Minimum height of the visible part of a window.
+const int kMinVisibleHeight = 30;
+// Minimum width of the visible part of a window.
+const int kMinVisibleWidth = 30;
+
+class DefaultMonitorInfoProvider : public MonitorInfoProvider {
+ public:
+  // Overridden from MonitorInfoProvider:
+  virtual gfx::Rect GetPrimaryMonitorWorkArea() const OVERRIDE {
+    return gfx::Screen::GetPrimaryMonitorWorkArea();
+  }
+  virtual gfx::Rect GetPrimaryMonitorBounds() const OVERRIDE {
+    return gfx::Screen::GetPrimaryMonitorBounds();
+  }
+  virtual gfx::Rect GetMonitorWorkAreaMatching(
+      const gfx::Rect& match_rect) const OVERRIDE {
+    return gfx::Screen::GetMonitorWorkAreaMatching(match_rect);
+  }
+};
 
 ///////////////////////////////////////////////////////////////////////////////
 // An implementation of WindowSizer::StateProvider that gets the last active
@@ -102,6 +124,11 @@ class DefaultStateProvider : public WindowSizer::StateProvider {
 ///////////////////////////////////////////////////////////////////////////////
 // WindowSizer, public:
 
+WindowSizer::WindowSizer(StateProvider* state_provider)
+    : state_provider_(state_provider),
+      monitor_info_provider_(new DefaultMonitorInfoProvider) {
+}
+
 WindowSizer::WindowSizer(StateProvider* state_provider,
                          MonitorInfoProvider* monitor_info_provider)
     : state_provider_(state_provider),
@@ -116,8 +143,7 @@ void WindowSizer::GetBrowserWindowBounds(const std::string& app_name,
                                          const gfx::Rect& specified_bounds,
                                          const Browser* browser,
                                          gfx::Rect* window_bounds) {
-  const WindowSizer sizer(new DefaultStateProvider(app_name, browser),
-                          CreateDefaultMonitorInfoProvider());
+  const WindowSizer sizer(new DefaultStateProvider(app_name, browser));
   sizer.DetermineWindowBounds(specified_bounds, window_bounds);
 }
 
@@ -196,40 +222,6 @@ void WindowSizer::GetDefaultWindowBounds(gfx::Rect* default_bounds) const {
                           default_width, default_height);
 }
 
-bool WindowSizer::PositionIsOffscreen(int position, Edge edge) const {
-  DCHECK(monitor_info_provider_.get());
-  size_t monitor_count = monitor_info_provider_->GetMonitorCount();
-  for (size_t i = 0; i < monitor_count; ++i) {
-    gfx::Rect work_area = monitor_info_provider_->GetWorkAreaAt(i);
-    switch (edge) {
-      case TOP:
-        if (position >= work_area.y())
-          return false;
-        break;
-      case LEFT:
-        if (position >= work_area.x())
-          return false;
-        break;
-      case BOTTOM:
-        if (position <= work_area.bottom())
-          return false;
-        break;
-      case RIGHT:
-        if (position <= work_area.right())
-          return false;
-        break;
-    }
-  }
-  return true;
-}
-
-namespace {
-  // Minimum height of the visible part of a window.
-  static const int kMinVisibleHeight = 30;
-  // Minimum width of the visible part of a window.
-  static const int kMinVisibleWidth = 30;
-}
-
 void WindowSizer::AdjustBoundsToBeVisibleOnMonitorContaining(
     const gfx::Rect& other_bounds,
     const gfx::Rect& saved_work_area,
diff --git a/chrome/browser/ui/window_sizer.h b/chrome/browser/ui/window_sizer.h
index 20fe2d1..43e5179 100644
--- a/chrome/browser/ui/window_sizer.h
+++ b/chrome/browser/ui/window_sizer.h
@@ -6,14 +6,30 @@
 #define CHROME_BROWSER_UI_WINDOW_SIZER_H_
 #pragma once
 
-#include <vector>
-
 #include "base/basictypes.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/gfx/rect.h"
 
 class Browser;
 
+// An interface implemented by an object that can retrieve information about
+// the monitors on the system.
+class MonitorInfoProvider {
+ public:
+  virtual ~MonitorInfoProvider() {}
+
+  // Returns the bounds of the work area of the primary monitor.
+  virtual gfx::Rect GetPrimaryMonitorWorkArea() const = 0;
+
+  // Returns the bounds of the primary monitor.
+  virtual gfx::Rect GetPrimaryMonitorBounds() const = 0;
+
+  // Returns the bounds of the work area of the monitor that most closely
+  // intersects the provided bounds.
+  virtual gfx::Rect GetMonitorWorkAreaMatching(
+      const gfx::Rect& match_rect) const = 0;
+};
+
 ///////////////////////////////////////////////////////////////////////////////
 // WindowSizer
 //
@@ -27,55 +43,18 @@ class Browser;
 //
 class WindowSizer {
  public:
-  class MonitorInfoProvider;
   class StateProvider;
 
-  // The WindowSizer assumes ownership of these objects.
+  // WindowSizer owns |state_provider| and will create a default
+  // MonitorInfoProvider using the physical screen.
+  explicit WindowSizer(StateProvider* state_provider);
+
+  // WindowSizer owns |state_provider| and |monitor_info_provider|.
+  // It will use the supplied monitor info provider. Used only for testing.
   WindowSizer(StateProvider* state_provider,
               MonitorInfoProvider* monitor_info_provider);
-  virtual ~WindowSizer();
 
-  // Static factory methods to create default MonitorInfoProvider
-  // instances.  The returned object is owned by the caller.
-  static MonitorInfoProvider* CreateDefaultMonitorInfoProvider();
-
-  // An interface implemented by an object that can retrieve information about
-  // the monitors on the system.
-  class MonitorInfoProvider {
-   public:
-    MonitorInfoProvider() {}
-    virtual ~MonitorInfoProvider() {}
-
-    // Returns the bounds of the work area of the primary monitor.
-    virtual gfx::Rect GetPrimaryMonitorWorkArea() const = 0;
-
-    // Returns the bounds of the primary monitor.
-    virtual gfx::Rect GetPrimaryMonitorBounds() const = 0;
-
-    // Returns the bounds of the work area of the monitor that most closely
-    // intersects the provided bounds.
-    virtual gfx::Rect GetMonitorWorkAreaMatching(
-        const gfx::Rect& match_rect) const = 0;
-
-    // Ensures number and coordinates of work areas are up-to-date.  You must
-    // call this before calling either of the below functions, as work areas can
-    // change while the program is running.
-    virtual void UpdateWorkAreas() = 0;
-
-    // Returns the number of monitors on the system.
-    size_t GetMonitorCount() const {
-      return work_areas_.size();
-    }
-
-    // Returns the bounds of the work area of the monitor at the specified
-    // index.
-    gfx::Rect GetWorkAreaAt(size_t index) const {
-      return work_areas_[index];
-    }
-
-   protected:
-    std::vector<gfx::Rect> work_areas_;
-  };
+  virtual ~WindowSizer();
 
   // An interface implemented by an object that can retrieve state from either a
   // persistent store or an existing window.
@@ -140,10 +119,6 @@ class WindowSizer {
   // size based on monitor size, etc.
   void GetDefaultWindowBounds(gfx::Rect* default_bounds) const;
 
-  // Returns true if the specified position is "offscreen" for the given edge,
-  // meaning that it's outside all work areas in the direction of that edge.
-  bool PositionIsOffscreen(int position, Edge edge) const;
-
   // Adjusts |bounds| to be visible onscreen, biased toward the work area of the
   // monitor containing |other_bounds|.  Despite the name, this doesn't
   // guarantee the bounds are fully contained within this monitor's work rect;
diff --git a/chrome/browser/ui/window_sizer_aura.cc b/chrome/browser/ui/window_sizer_aura.cc
index c8d313b..61ac5bb 100644
--- a/chrome/browser/ui/window_sizer_aura.cc
+++ b/chrome/browser/ui/window_sizer_aura.cc
@@ -4,47 +4,10 @@
 
 #include "chrome/browser/ui/window_sizer.h"
 
-#include "base/compiler_specific.h"
-#include "ui/gfx/screen.h"
-
 // This doesn't matter for aura, which has different tiling.
 // static
 const int WindowSizer::kWindowTilePixels = 10;
 
-// An implementation of WindowSizer::MonitorInfoProvider. This assumes a single
-// monitor, which is currently the case.
-class DefaultMonitorInfoProvider : public WindowSizer::MonitorInfoProvider {
- public:
-  DefaultMonitorInfoProvider() {}
-
-  virtual gfx::Rect GetPrimaryMonitorWorkArea() const OVERRIDE {
-    return gfx::Screen::GetMonitorWorkAreaNearestPoint(gfx::Point());
-  }
-
-  virtual gfx::Rect GetPrimaryMonitorBounds() const OVERRIDE {
-    return gfx::Screen::GetMonitorAreaNearestPoint(gfx::Point());
-  }
-
-  virtual gfx::Rect GetMonitorWorkAreaMatching(
-      const gfx::Rect& match_rect) const OVERRIDE {
-    return gfx::Screen::GetMonitorWorkAreaNearestPoint(gfx::Point());
-  }
-
-  virtual void UpdateWorkAreas() OVERRIDE {
-    work_areas_.clear();
-    work_areas_.push_back(GetPrimaryMonitorBounds());
-  }
-
- private:
-  DISALLOW_COPY_AND_ASSIGN(DefaultMonitorInfoProvider);
-};
-
-// static
-WindowSizer::MonitorInfoProvider*
-WindowSizer::CreateDefaultMonitorInfoProvider() {
-  return new DefaultMonitorInfoProvider();
-}
-
 // static
 gfx::Point WindowSizer::GetDefaultPopupOrigin(const gfx::Size& size) {
   // TODO(oshima):This is used to control panel/popups, and this may not be
diff --git a/chrome/browser/ui/window_sizer_gtk.cc b/chrome/browser/ui/window_sizer_gtk.cc
index 6746eea..133fb0c 100644
--- a/chrome/browser/ui/window_sizer_gtk.cc
+++ b/chrome/browser/ui/window_sizer_gtk.cc
@@ -10,6 +10,7 @@
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
+#include "ui/gfx/screen.h"
 
 // Used to pad the default new window size.  On Windows, this is also used for
 // positioning new windows (each window is offset from the previous one).
@@ -17,93 +18,9 @@
 // size.
 const int WindowSizer::kWindowTilePixels = 10;
 
-// An implementation of WindowSizer::MonitorInfoProvider that gets the actual
-// monitor information from X via GDK.
-class DefaultMonitorInfoProvider : public WindowSizer::MonitorInfoProvider {
- public:
-  DefaultMonitorInfoProvider() { }
-
-  virtual gfx::Rect GetPrimaryMonitorWorkArea() const {
-    gfx::Rect rect;
-    if (GetScreenWorkArea(&rect))
-      return rect.Intersect(GetPrimaryMonitorBounds());
-
-    // Return the best we've got.
-    return GetPrimaryMonitorBounds();
-  }
-
-  virtual gfx::Rect GetPrimaryMonitorBounds() const {
-    GdkScreen* screen = gdk_screen_get_default();
-    GdkRectangle rect;
-    gdk_screen_get_monitor_geometry(screen, 0, &rect);
-    return gfx::Rect(rect);
-  }
-
-  virtual gfx::Rect GetMonitorWorkAreaMatching(
-      const gfx::Rect& match_rect) const {
-    // TODO(thestig) Implement multi-monitor support.
-    return GetPrimaryMonitorWorkArea();
-  }
-
-  void UpdateWorkAreas() {
-    // TODO(thestig) Implement multi-monitor support.
-    work_areas_.clear();
-    work_areas_.push_back(GetPrimaryMonitorBounds());
-  }
-
- private:
-  // Get the available screen space as a gfx::Rect, or return false if
-  // if it's unavailable (i.e. the window manager doesn't support
-  // retrieving this).
-  // TODO(thestig) Use _NET_CURRENT_DESKTOP here as well?
-  bool GetScreenWorkArea(gfx::Rect* out_rect) const {
-    gboolean ok;
-    guchar* raw_data = NULL;
-    gint data_len = 0;
-    ok = gdk_property_get(gdk_get_default_root_window(),  // a gdk window
-                          gdk_atom_intern("_NET_WORKAREA", FALSE),  // property
-                          gdk_atom_intern("CARDINAL", FALSE),  // property type
-                          0,  // byte offset into property
-                          0xff,  // property length to retrieve
-                          false,  // delete property after retrieval?
-                          NULL,  // returned property type
-                          NULL,  // returned data format
-                          &data_len,  // returned data len
-                          &raw_data);  // returned data
-    if (!ok)
-      return false;
-
-    // We expect to get four longs back: x, y, width, height.
-    if (data_len < static_cast<gint>(4 * sizeof(glong))) {
-      NOTREACHED();
-      g_free(raw_data);
-      return false;
-    }
-
-    glong* data = reinterpret_cast<glong*>(raw_data);
-    gint x = data[0];
-    gint y = data[1];
-    gint width = data[2];
-    gint height = data[3];
-    g_free(raw_data);
-
-    out_rect->SetRect(x, y, width, height);
-    return true;
-  }
-
-  DISALLOW_COPY_AND_ASSIGN(DefaultMonitorInfoProvider);
-};
-
-// static
-WindowSizer::MonitorInfoProvider*
-WindowSizer::CreateDefaultMonitorInfoProvider() {
-  return new DefaultMonitorInfoProvider();
-}
-
 // static
 gfx::Point WindowSizer::GetDefaultPopupOrigin(const gfx::Size& size) {
-  scoped_ptr<MonitorInfoProvider> provider(CreateDefaultMonitorInfoProvider());
-  gfx::Rect monitor_bounds = provider->GetPrimaryMonitorWorkArea();
+  gfx::Rect monitor_bounds = gfx::Screen::GetPrimaryMonitorWorkArea();
   gfx::Point corner(monitor_bounds.x(), monitor_bounds.y());
   if (Browser* browser = BrowserList::GetLastActive()) {
     GtkWindow* window =
diff --git a/chrome/browser/ui/window_sizer_mac.mm b/chrome/browser/ui/window_sizer_mac.mm
index 56cf887..cfc0df1 100644
--- a/chrome/browser/ui/window_sizer_mac.mm
+++ b/chrome/browser/ui/window_sizer_mac.mm
@@ -2,113 +2,18 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
+#include "chrome/browser/ui/window_sizer.h"
+
 #import <Cocoa/Cocoa.h>
+
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_list.h"
 #include "chrome/browser/ui/browser_window.h"
-#include "chrome/browser/ui/window_sizer.h"
-
 
 // How much horizontal and vertical offset there is between newly
 // opened windows.
 const int WindowSizer::kWindowTilePixels = 22;
 
-namespace {
-
-class DefaultMonitorInfoProvider : public WindowSizer::MonitorInfoProvider {
- public:
-  DefaultMonitorInfoProvider() { }
-
-  // Overridden from WindowSizer::MonitorInfoProvider:
-  virtual gfx::Rect GetPrimaryMonitorWorkArea() const  {
-    // Primary monitor is defined as the monitor with the menubar,
-    // which is always at index 0.
-    NSScreen* primary = [[NSScreen screens] objectAtIndex:0];
-    NSRect frame = [primary frame];
-    NSRect visible_frame = [primary visibleFrame];
-
-    // Convert coordinate systems.
-    gfx::Rect rect = gfx::Rect(NSRectToCGRect(visible_frame));
-    rect.set_y(frame.size.height -
-               visible_frame.origin.y - visible_frame.size.height);
-    return rect;
-  }
-
-  virtual gfx::Rect GetPrimaryMonitorBounds() const  {
-    // Primary monitor is defined as the monitor with the menubar,
-    // which is always at index 0.
-    NSScreen* primary = [[NSScreen screens] objectAtIndex:0];
-    return gfx::Rect(NSRectToCGRect([primary frame]));
-  }
-
-  virtual gfx::Rect GetMonitorWorkAreaMatching(
-      const gfx::Rect& match_rect) const {
-    NSScreen* match_screen = GetMatchingScreen(match_rect);
-    return ConvertCoordinateSystem([match_screen visibleFrame]);
-  }
-
-  virtual void UpdateWorkAreas();
-
- private:
-  // Returns a pointer to the screen that most closely matches the
-  // given |match_rect|.  This function currently returns the screen
-  // that contains the largest amount of |match_rect| by area.
-  NSScreen* GetMatchingScreen(const gfx::Rect& match_rect) const {
-    // Default to the monitor with the current keyboard focus, in case
-    // |match_rect| is not on any screen at all.
-    NSScreen* max_screen = [NSScreen mainScreen];
-    int max_area = 0;
-
-    for (NSScreen* screen in [NSScreen screens]) {
-      gfx::Rect monitor_area = ConvertCoordinateSystem([screen frame]);
-      gfx::Rect intersection = monitor_area.Intersect(match_rect);
-      int area = intersection.width() * intersection.height();
-      if (area > max_area) {
-        max_area = area;
-        max_screen = screen;
-      }
-    }
-
-    return max_screen;
-  }
-
-  // The lower left corner of screen 0 is always at (0, 0).  The
-  // cross-platform code expects the origin to be in the upper left,
-  // so we have to translate |ns_rect| to the new coordinate
-  // system.
-  gfx::Rect ConvertCoordinateSystem(NSRect ns_rect) const;
-
-  DISALLOW_COPY_AND_ASSIGN(DefaultMonitorInfoProvider);
-};
-
-void DefaultMonitorInfoProvider::UpdateWorkAreas() {
-  work_areas_.clear();
-
-  for (NSScreen* screen in [NSScreen screens]) {
-    gfx::Rect rect = ConvertCoordinateSystem([screen visibleFrame]);
-    work_areas_.push_back(rect);
-  }
-}
-
-gfx::Rect DefaultMonitorInfoProvider::ConvertCoordinateSystem(
-    NSRect ns_rect) const {
-  // Primary monitor is defined as the monitor with the menubar,
-  // which is always at index 0.
-  NSScreen* primary_screen = [[NSScreen screens] objectAtIndex:0];
-  float primary_screen_height = [primary_screen frame].size.height;
-  gfx::Rect rect(NSRectToCGRect(ns_rect));
-  rect.set_y(primary_screen_height - rect.y() - rect.height());
-  return rect;
-}
-
-}  // namespace
-
-// static
-WindowSizer::MonitorInfoProvider*
-WindowSizer::CreateDefaultMonitorInfoProvider() {
-  return new DefaultMonitorInfoProvider();
-}
-
 // static
 gfx::Point WindowSizer::GetDefaultPopupOrigin(const gfx::Size& size) {
   NSRect work_area = [[NSScreen mainScreen] visibleFrame];
diff --git a/chrome/browser/ui/window_sizer_unittest.cc b/chrome/browser/ui/window_sizer_unittest.cc
index ab94b40..2beb4d8 100644
--- a/chrome/browser/ui/window_sizer_unittest.cc
+++ b/chrome/browser/ui/window_sizer_unittest.cc
@@ -43,7 +43,7 @@ static int kWindowTilePixels = WindowSizer::kWindowTilePixels;
 
 // Testing implementation of WindowSizer::MonitorInfoProvider that we can use
 // to fake various monitor layouts and sizes.
-class TestMonitorInfoProvider : public WindowSizer::MonitorInfoProvider {
+class TestMonitorInfoProvider : public MonitorInfoProvider {
  public:
   TestMonitorInfoProvider() {}
   virtual ~TestMonitorInfoProvider() {}
@@ -68,8 +68,6 @@ class TestMonitorInfoProvider : public WindowSizer::MonitorInfoProvider {
     return work_areas_[GetMonitorIndexMatchingBounds(match_rect)];
   }
 
-  virtual void UpdateWorkAreas() OVERRIDE {}
-
  private:
   size_t GetMonitorIndexMatchingBounds(const gfx::Rect& match_rect) const {
     int max_area = 0;
@@ -88,6 +86,7 @@ class TestMonitorInfoProvider : public WindowSizer::MonitorInfoProvider {
   }
 
   std::vector<gfx::Rect> monitor_bounds_;
+  std::vector<gfx::Rect> work_areas_;
 
   DISALLOW_COPY_AND_ASSIGN(TestMonitorInfoProvider);
 };
diff --git a/chrome/browser/ui/window_sizer_win.cc b/chrome/browser/ui/window_sizer_win.cc
index 9a4fa37..6c7fd28 100644
--- a/chrome/browser/ui/window_sizer_win.cc
+++ b/chrome/browser/ui/window_sizer_win.cc
@@ -12,66 +12,6 @@
 // opened windows.
 const int WindowSizer::kWindowTilePixels = 10;
 
-// An implementation of WindowSizer::MonitorInfoProvider that gets the actual
-// monitor information from Windows.
-class DefaultMonitorInfoProvider : public WindowSizer::MonitorInfoProvider {
- public:
-  DefaultMonitorInfoProvider() { }
-
-  // Overridden from WindowSizer::MonitorInfoProvider:
-  virtual gfx::Rect GetPrimaryMonitorWorkArea() const {
-    return gfx::Rect(GetMonitorInfoForMonitor(MonitorFromWindow(NULL,
-        MONITOR_DEFAULTTOPRIMARY)).rcWork);
-  }
-
-  virtual gfx::Rect GetPrimaryMonitorBounds() const {
-    return gfx::Rect(GetMonitorInfoForMonitor(MonitorFromWindow(NULL,
-        MONITOR_DEFAULTTOPRIMARY)).rcMonitor);
-  }
-
-  virtual gfx::Rect GetMonitorWorkAreaMatching(
-      const gfx::Rect& match_rect) const {
-    RECT other_bounds_rect = match_rect.ToRECT();
-    MONITORINFO monitor_info = GetMonitorInfoForMonitor(MonitorFromRect(
-        &other_bounds_rect, MONITOR_DEFAULTTONEAREST));
-    return gfx::Rect(monitor_info.rcWork);
-  }
-
-  void UpdateWorkAreas() {
-    work_areas_.clear();
-    EnumDisplayMonitors(NULL, NULL,
-                        &DefaultMonitorInfoProvider::MonitorEnumProc,
-                        reinterpret_cast<LPARAM>(&work_areas_));
-  }
-
- private:
-  // A callback for EnumDisplayMonitors that records the work area of the
-  // current monitor in the enumeration.
-  static BOOL CALLBACK MonitorEnumProc(HMONITOR monitor,
-                                       HDC monitor_dc,
-                                       LPRECT monitor_rect,
-                                       LPARAM data) {
-    reinterpret_cast<std::vector<gfx::Rect>*>(data)->push_back(
-        gfx::Rect(GetMonitorInfoForMonitor(monitor).rcWork));
-    return TRUE;
-  }
-
-  static MONITORINFO GetMonitorInfoForMonitor(HMONITOR monitor) {
-    MONITORINFO monitor_info = { 0 };
-    monitor_info.cbSize = sizeof(monitor_info);
-    GetMonitorInfo(monitor, &monitor_info);
-    return monitor_info;
-  }
-
-  DISALLOW_COPY_AND_ASSIGN(DefaultMonitorInfoProvider);
-};
-
-// static
-WindowSizer::MonitorInfoProvider*
-WindowSizer::CreateDefaultMonitorInfoProvider() {
-  return new DefaultMonitorInfoProvider();
-}
-
 // static
 gfx::Point WindowSizer::GetDefaultPopupOrigin(const gfx::Size& size) {
   RECT area;
diff --git a/ui/gfx/screen.h b/ui/gfx/screen.h
index 45a15ad..cd363b3 100644
--- a/ui/gfx/screen.h
+++ b/ui/gfx/screen.h
@@ -43,6 +43,17 @@ class UI_EXPORT Screen {
   // the monitor nearest the specified point.
   static gfx::Rect GetMonitorAreaNearestPoint(const gfx::Point& point);
 
+  // Returns the bounds of the work area of the primary monitor.
+  static gfx::Rect GetPrimaryMonitorWorkArea();
+
+  // Returns the bounds of the primary monitor.
+  static gfx::Rect GetPrimaryMonitorBounds();
+
+  // Returns the bounds of the work area of the monitor that most closely
+  // intersects the provided bounds.
+  static gfx::Rect GetMonitorWorkAreaMatching(
+      const gfx::Rect& match_rect);
+
   // Returns the window under the cursor.
   static gfx::NativeWindow GetWindowAtCursorScreenPoint();
 
diff --git a/ui/gfx/screen_aura.cc b/ui/gfx/screen_aura.cc
index 0093af6..ea4216f 100644
--- a/ui/gfx/screen_aura.cc
+++ b/ui/gfx/screen_aura.cc
@@ -48,6 +48,21 @@ gfx::Rect Screen::GetMonitorAreaNearestPoint(const gfx::Point& point) {
 }
 
 // static
+gfx::Rect Screen::GetPrimaryMonitorWorkArea() {
+  return instance_->GetMonitorWorkAreaNearestPoint(gfx::Point());
+}
+
+// static
+gfx::Rect Screen::GetPrimaryMonitorBounds() {
+  return instance_->GetMonitorAreaNearestPoint(gfx::Point());
+}
+
+// static
+gfx::Rect Screen::GetMonitorWorkAreaMatching(const gfx::Rect& match_rect) {
+  return instance_->GetMonitorWorkAreaNearestPoint(gfx::Point());
+}
+
+// static
 gfx::NativeWindow Screen::GetWindowAtCursorScreenPoint() {
   return instance_->GetWindowAtCursorScreenPointImpl();
 }
diff --git a/ui/gfx/screen_gtk.cc b/ui/gfx/screen_gtk.cc
index 42799b7..579ad1a 100644
--- a/ui/gfx/screen_gtk.cc
+++ b/ui/gfx/screen_gtk.cc
@@ -9,6 +9,45 @@
 
 #include "base/logging.h"
 
+namespace {
+
+bool GetScreenWorkArea(gfx::Rect* out_rect) {
+  gboolean ok;
+  guchar* raw_data = NULL;
+  gint data_len = 0;
+  ok = gdk_property_get(gdk_get_default_root_window(),  // a gdk window
+                        gdk_atom_intern("_NET_WORKAREA", FALSE),  // property
+                        gdk_atom_intern("CARDINAL", FALSE),  // property type
+                        0,  // byte offset into property
+                        0xff,  // property length to retrieve
+                        false,  // delete property after retrieval?
+                        NULL,  // returned property type
+                        NULL,  // returned data format
+                        &data_len,  // returned data len
+                        &raw_data);  // returned data
+  if (!ok)
+    return false;
+
+  // We expect to get four longs back: x, y, width, height.
+  if (data_len < static_cast<gint>(4 * sizeof(glong))) {
+    NOTREACHED();
+    g_free(raw_data);
+    return false;
+  }
+
+  glong* data = reinterpret_cast<glong*>(raw_data);
+  gint x = data[0];
+  gint y = data[1];
+  gint width = data[2];
+  gint height = data[3];
+  g_free(raw_data);
+
+  out_rect->SetRect(x, y, width, height);
+  return true;
+}
+
+}  // namespace
+
 namespace gfx {
 
 // static
@@ -64,6 +103,30 @@ gfx::Rect Screen::GetMonitorAreaNearestPoint(const gfx::Point& point) {
 }
 
 // static
+gfx::Rect Screen::GetPrimaryMonitorWorkArea() {
+  gfx::Rect rect;
+  if (GetScreenWorkArea(&rect))
+    return rect.Intersect(GetPrimaryMonitorBounds());
+
+  // Return the best we've got.
+  return GetPrimaryMonitorBounds();
+}
+
+// static
+gfx::Rect Screen::GetPrimaryMonitorBounds() {
+  GdkScreen* screen = gdk_screen_get_default();
+  GdkRectangle rect;
+  gdk_screen_get_monitor_geometry(screen, 0, &rect);
+  return gfx::Rect(rect);
+}
+
+// static
+gfx::Rect Screen::GetMonitorWorkAreaMatching(const gfx::Rect& match_rect) {
+  // TODO(thestig) Implement multi-monitor support.
+  return GetPrimaryMonitorWorkArea();
+}
+
+// static
 gfx::NativeWindow Screen::GetWindowAtCursorScreenPoint() {
   GdkWindow* window = gdk_window_at_pointer(NULL, NULL);
   if (!window)
diff --git a/ui/gfx/screen_mac.mm b/ui/gfx/screen_mac.mm
index 6bf0992..a3b7306d 100644
--- a/ui/gfx/screen_mac.mm
+++ b/ui/gfx/screen_mac.mm
@@ -7,6 +7,39 @@
 #import <ApplicationServices/ApplicationServices.h>
 #import <Cocoa/Cocoa.h>
 
+namespace {
+
+gfx::Rect ConvertCoordinateSystem(NSRect ns_rect) {
+  // Primary monitor is defined as the monitor with the menubar,
+  // which is always at index 0.
+  NSScreen* primary_screen = [[NSScreen screens] objectAtIndex:0];
+  float primary_screen_height = [primary_screen frame].size.height;
+  gfx::Rect rect(NSRectToCGRect(ns_rect));
+  rect.set_y(primary_screen_height - rect.y() - rect.height());
+  return rect;
+}
+
+NSScreen* GetMatchingScreen(const gfx::Rect& match_rect) {
+  // Default to the monitor with the current keyboard focus, in case
+  // |match_rect| is not on any screen at all.
+  NSScreen* max_screen = [NSScreen mainScreen];
+  int max_area = 0;
+
+  for (NSScreen* screen in [NSScreen screens]) {
+    gfx::Rect monitor_area = ConvertCoordinateSystem([screen frame]);
+    gfx::Rect intersection = monitor_area.Intersect(match_rect);
+    int area = intersection.width() * intersection.height();
+    if (area > max_area) {
+      max_area = area;
+      max_screen = screen;
+    }
+  }
+
+  return max_screen;
+}
+
+}  // namespace
+
 namespace gfx {
 
 // static
@@ -19,6 +52,35 @@ gfx::Point Screen::GetCursorScreenPoint() {
 }
 
 // static
+gfx::Rect Screen::GetPrimaryMonitorWorkArea() {
+  // Primary monitor is defined as the monitor with the menubar,
+  // which is always at index 0.
+  NSScreen* primary = [[NSScreen screens] objectAtIndex:0];
+  NSRect frame = [primary frame];
+  NSRect visible_frame = [primary visibleFrame];
+
+  // Convert coordinate systems.
+  gfx::Rect rect = gfx::Rect(NSRectToCGRect(visible_frame));
+  rect.set_y(frame.size.height - visible_frame.origin.y -
+             visible_frame.size.height);
+  return rect;
+}
+
+// static
+gfx::Rect Screen::GetPrimaryMonitorBounds() {
+  // Primary monitor is defined as the monitor with the menubar,
+  // which is always at index 0.
+  NSScreen* primary = [[NSScreen screens] objectAtIndex:0];
+  return gfx::Rect(NSRectToCGRect([primary frame]));
+}
+
+// static
+gfx::Rect Screen::GetMonitorWorkAreaMatching(const gfx::Rect& match_rect) {
+  NSScreen* match_screen = GetMatchingScreen(match_rect);
+  return ConvertCoordinateSystem([match_screen visibleFrame]);
+}
+
+// static
 gfx::Size Screen::GetPrimaryMonitorSize() {
   CGDirectDisplayID main_display = CGMainDisplayID();
   return gfx::Size(CGDisplayPixelsWide(main_display),
diff --git a/ui/gfx/screen_win.cc b/ui/gfx/screen_win.cc
index 2873b72..ea74c82 100644
--- a/ui/gfx/screen_win.cc
+++ b/ui/gfx/screen_win.cc
@@ -6,6 +6,17 @@
 
 #include <windows.h>
 
+namespace {
+
+MONITORINFO GetMonitorInfoForMonitor(HMONITOR monitor) {
+  MONITORINFO monitor_info = { 0 };
+  monitor_info.cbSize = sizeof(monitor_info);
+  GetMonitorInfo(monitor, &monitor_info);
+  return monitor_info;
+}
+
+}  // namespace
+
 namespace gfx {
 
 // static
@@ -55,6 +66,26 @@ gfx::Rect Screen::GetMonitorAreaNearestPoint(const gfx::Point& point) {
 }
 
 // static
+gfx::Rect Screen::GetPrimaryMonitorWorkArea() {
+  return gfx::Rect(GetMonitorInfoForMonitor(MonitorFromWindow(NULL,
+      MONITOR_DEFAULTTOPRIMARY)).rcWork);
+}
+
+// static
+gfx::Rect Screen::GetPrimaryMonitorBounds() {
+  return gfx::Rect(GetMonitorInfoForMonitor(MonitorFromWindow(NULL,
+      MONITOR_DEFAULTTOPRIMARY)).rcMonitor);
+}
+
+// static
+gfx::Rect Screen::GetMonitorWorkAreaMatching(const gfx::Rect& match_rect) {
+  RECT other_bounds_rect = match_rect.ToRECT();
+  MONITORINFO monitor_info = GetMonitorInfoForMonitor(MonitorFromRect(
+      &other_bounds_rect, MONITOR_DEFAULTTONEAREST));
+  return gfx::Rect(monitor_info.rcWork);
+}
+
+// static
 gfx::NativeWindow Screen::GetWindowAtCursorScreenPoint() {
   POINT location;
   return GetCursorPos(&location) ? WindowFromPoint(location) : NULL;