Aura: delay draw on Expose to avoid getting behind

ui/aura/desktop.h

Index: ui/aura/desktop.h
diff --git a/ui/aura/desktop.h b/ui/aura/desktop.h
index df12a6cd4f21008e2c2c97eac5f88adb0fdad228..d76e43eefdf1743fb7fd2b4973e5452eeacde888 100644
--- a/ui/aura/desktop.h
+++ b/ui/aura/desktop.h
@@ -150,6 +150,9 @@ class AURA_EXPORT Desktop : public ui::CompositorDelegate,
   void ToggleFullScreen();
 #endif
 
+  // Overridden from ui::CompositorDelegate:
+  virtual void ScheduleDraw();
+
  private:
   Desktop();
   virtual ~Desktop();
@@ -162,9 +165,6 @@ class AURA_EXPORT Desktop : public ui::CompositorDelegate,
   bool ProcessKeyEvent(Window* target, KeyEvent* event);
   ui::TouchStatus ProcessTouchEvent(Window* target, TouchEvent* event);
 
-  // Overridden from ui::CompositorDelegate
-  virtual void ScheduleDraw();
-
   // Overridden from Window:
   virtual bool CanFocus() const OVERRIDE;
   virtual internal::FocusManager* GetFocusManager() OVERRIDE;