Thread ui transform animations

ui/aura/root_window.h

Index: ui/aura/root_window.h
diff --git a/ui/aura/root_window.h b/ui/aura/root_window.h
index 6102302f764042773314e3ccd76293cc2ae7cdc7..9acb581754ce277aa992b7f8246891e307de0c6f 100644
--- a/ui/aura/root_window.h
+++ b/ui/aura/root_window.h
@@ -12,6 +12,7 @@
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "base/message_loop.h"
+#include "base/time.h"
 #include "ui/aura/aura_export.h"
 #include "ui/aura/client/capture_delegate.h"
 #include "ui/aura/root_window_host_delegate.h"
@@ -242,6 +243,9 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
   // Overridden from ui::CompositorDelegate:
   virtual void ScheduleDraw() OVERRIDE;
 
+  // Make ScheduleDraw use a delay when scheduling draws.
+  void DelayDrawsForTesting(base::TimeDelta delay);
+
   // Overridden from ui::CompositorObserver:
   virtual void OnCompositingDidCommit(ui::Compositor*) OVERRIDE;
   virtual void OnCompositingStarted(ui::Compositor*,
@@ -402,6 +406,8 @@ class AURA_EXPORT RootWindow : public ui::CompositorDelegate,
 
   bool defer_draw_scheduling_;
 
+  base::TimeDelta draw_scheduling_delay_for_testing_;
+
   // How many holds are outstanding. We try to defer dispatching mouse moves
   // while the count is > 0.
   int mouse_move_hold_count_;