Move ash specific cursor code to CursorManager.

Main changes are as follows.
- Move the responsibility of managing cursors to ash::CursorManager from aura::RootWindowHostLinux.
- Set the same cursor to all root windows with CursorManager so that cursor is updated properly while dragging across displays
- Introduce CursorLoader class, which implements platform specific cursor loading.
- Add SetDeviceScaleFactor to CursorClient, which sets the device scale factor used for the cursor.

BUG=132862,144756


Review URL: https://chromiumcodereview.appspot.com/10919135

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@156109 0039d316-1c4b-4281-b951-d872f2087c98

1 files changed, 22 insertions, 2 deletions

diff --git a/ash/wm/cursor_manager.cc b/ash/wm/cursor_manager.cc
index 1ebc72b..3afee4b 100644
--- a/ash/wm/cursor_manager.cc
+++ b/ash/wm/cursor_manager.cc
@@ -5,8 +5,10 @@
 #include "ash/wm/cursor_manager.h"
 
 #include "ash/wm/cursor_delegate.h"
+#include "ash/wm/image_cursors.h"
 #include "base/logging.h"
 #include "ui/aura/env.h"
+#include "ui/base/cursor/cursor.h"
 
 namespace ash {
 
@@ -15,7 +17,9 @@ CursorManager::CursorManager()
       cursor_lock_count_(0),
       did_cursor_change_(false),
       cursor_to_set_on_unlock_(0),
-      cursor_visible_(true) {
+      cursor_visible_(true),
+      current_cursor_(ui::kCursorNone),
+      image_cursors_(new ImageCursors) {
 }
 
 CursorManager::~CursorManager() {
@@ -42,7 +46,7 @@ void CursorManager::UnlockCursor() {
 void CursorManager::SetCursor(gfx::NativeCursor cursor) {
   if (cursor_lock_count_ == 0) {
     if (delegate_)
-      delegate_->SetCursor(cursor);
+      SetCursorInternal(cursor);
   } else {
     cursor_to_set_on_unlock_ = cursor;
     did_cursor_change_ = true;
@@ -59,4 +63,20 @@ bool CursorManager::IsCursorVisible() const {
   return cursor_visible_;
 }
 
+void CursorManager::SetDeviceScaleFactor(float device_scale_factor) {
+  if (image_cursors_->GetDeviceScaleFactor() == device_scale_factor)
+    return;
+  image_cursors_->SetDeviceScaleFactor(device_scale_factor);
+  SetCursorInternal(current_cursor_);
+}
+
+void CursorManager::SetCursorInternal(gfx::NativeCursor cursor) {
+  DCHECK(delegate_);
+  current_cursor_ = cursor;
+  image_cursors_->SetPlatformCursor(&current_cursor_);
+  current_cursor_.set_device_scale_factor(
+      image_cursors_->GetDeviceScaleFactor());
+  delegate_->SetCursor(current_cursor_);
+}
+
 }  // namespace ash