cc: Split animating and drawing into separate actions

cc/trees/thread_proxy.h

Index: cc/trees/thread_proxy.h
diff --git a/cc/trees/thread_proxy.h b/cc/trees/thread_proxy.h
index c0203af10538a664d20ebe065402cece4a4a474b..1d41f6688b7dccf6f913d516f448d0f2c318403e 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -78,11 +78,13 @@ class ThreadProxy : public Proxy,
   virtual void BeginImplFrame(const BeginFrameArgs& args) OVERRIDE;
   virtual void OnCanDrawStateChanged(bool can_draw) OVERRIDE;
   virtual void NotifyReadyToActivate() OVERRIDE;
-  // Please call these 2 functions through
-  // LayerTreeHostImpl's SetNeedsRedraw() and SetNeedsRedrawRect().
+  // Please call these 3 functions through
+  // LayerTreeHostImpl's SetNeedsRedraw(), SetNeedsRedrawRect() and
+  // SetNeedsAnimate().
   virtual void SetNeedsRedrawOnImplThread() OVERRIDE;
   virtual void SetNeedsRedrawRectOnImplThread(const gfx::Rect& dirty_rect)
       OVERRIDE;
+  virtual void SetNeedsAnimateOnImplThread() OVERRIDE;
   virtual void SetNeedsManageTilesOnImplThread() OVERRIDE;
   virtual void DidInitializeVisibleTileOnImplThread() OVERRIDE;
   virtual void SetNeedsCommitOnImplThread() OVERRIDE;
@@ -106,6 +108,7 @@ class ThreadProxy : public Proxy,
       OVERRIDE;
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapForced() OVERRIDE;
   virtual DrawSwapReadbackResult ScheduledActionDrawAndReadback() OVERRIDE;
+  virtual void ScheduledActionAnimate() OVERRIDE;
   virtual void ScheduledActionCommit() OVERRIDE;
   virtual void ScheduledActionUpdateVisibleTiles() OVERRIDE;
   virtual void ScheduledActionActivatePendingTree() OVERRIDE;
@@ -292,7 +295,7 @@ class ThreadProxy : public Proxy,
 
     // Set when we freeze animations to avoid checkerboarding.
     bool animations_frozen_until_next_draw;
-    base::TimeTicks animation_freeze_time;
+    base::TimeTicks animation_time;
 
     base::TimeTicks smoothness_takes_priority_expiration_time;
     bool renew_tree_priority_pending;