Implement cursor compositing mode on Ash

ash/display/display_controller.h

Index: ash/display/display_controller.h
diff --git a/ash/display/display_controller.h b/ash/display/display_controller.h
index 839e70b5651c97dbc7bc0f3f988529f5027f8c24..0fc68aec0ed7210e8b5220478e7f716f5995ee4a 100644
--- a/ash/display/display_controller.h
+++ b/ash/display/display_controller.h
@@ -38,6 +38,7 @@ class Insets;
 
 namespace ash {
 namespace internal {
+class CursorWindowController;
 class DisplayInfo;
 class DisplayManager;
 class FocusActivationStore;
@@ -76,6 +77,10 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver,
   // TODO(oshima): Move this out from DisplayController;
   static int64 GetPrimaryDisplayId();
 
+  internal::CursorWindowController* cursor_window_controller() {
+    return cursor_window_controller_.get();
+  }
+
   internal::MirrorWindowController* mirror_window_controller() {
     return mirror_window_controller_.get();
   }
@@ -107,6 +112,13 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver,
   // Swap primary and secondary display.
   void SwapPrimaryDisplay();
 
+  // Enable/Disable cursor compositing.
+  void SetCursorCompositingEnabled(bool enabled);
+
+  // Sets the display on which to draw cursor.
+  // Only applicable when cursor compositing is enabled.
+  void SetDisplayForCursor(const gfx::Display& display);
+
   // Sets the ID of the primary display.  If the display is not connected, it
   // will switch the primary display when connected.
   void SetPrimaryDisplayId(int64 id);
@@ -168,6 +180,8 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver,
 
   void UpdateHostWindowNames();
 
+  void UpdateCursorWindowContainer();
+
   class DisplayChangeLimiter {
    public:
     DisplayChangeLimiter();
@@ -199,6 +213,7 @@ class ASH_EXPORT DisplayController : public gfx::DisplayObserver,
 
   scoped_ptr<internal::FocusActivationStore> focus_activation_store_;
 
+  scoped_ptr<internal::CursorWindowController> cursor_window_controller_;
   scoped_ptr<internal::MirrorWindowController> mirror_window_controller_;
   scoped_ptr<internal::VirtualKeyboardWindowController>
       virtual_keyboard_window_controller_;