Reenable triggering of screen rotations by sensors.

views/desktop/desktop_window_view.h

Index: views/desktop/desktop_window_view.h
diff --git a/views/desktop/desktop_window_view.h b/views/desktop/desktop_window_view.h
index fadc04efbcb3871a080c3f09549c457a31b0c32b..54471c954d92ad18305f54a1a7d7b33b1145358b 100644
--- a/views/desktop/desktop_window_view.h
+++ b/views/desktop/desktop_window_view.h
@@ -6,16 +6,22 @@
 #define VIEWS_DESKTOP_DESKTOP_WINDOW_VIEW_H_
 
 #include "base/observer_list.h"
+#include "ui/gfx/compositor/layer_animation_observer.h"
 #include "views/view.h"
 #include "views/widget/widget_delegate.h"
 
+namespace ui {
+class LayerAnimationSequence;
+}  // namespace ui
+
 namespace views {
 class NativeWidgetViews;
 class Widget;
 
 namespace desktop {
 
-class DesktopWindowView : public WidgetDelegateView {
+class DesktopWindowView : public WidgetDelegateView,
+                          public ui::LayerAnimationObserver {
  public:
   // Observers can listen to various events on the desktop.
   class Observer {
@@ -73,6 +79,14 @@ class DesktopWindowView : public WidgetDelegateView {
   virtual View* GetContentsView() OVERRIDE;
   virtual NonClientFrameView* CreateNonClientFrameView() OVERRIDE;
 
+  // Implementation of ui::LayerAnimationObserver:
+  virtual void OnLayerAnimationEnded(
+      const ui::LayerAnimationSequence* animation) OVERRIDE;
+  virtual void OnLayerAnimationScheduled(
+      const ui::LayerAnimationSequence* animation) OVERRIDE;
+  virtual void OnLayerAnimationAborted(
+      const ui::LayerAnimationSequence* animation) OVERRIDE;
+
   ObserverList<Observer> observers_;
   DesktopType type_;
   Widget* widget_;