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 680a448cca32286a5995bef39d87bd9f6da40258..6fe5a3f8f3b1131fd11980a4cfdd5d557bc84649 100644
--- a/cc/trees/thread_proxy.h
+++ b/cc/trees/thread_proxy.h
@@ -106,6 +106,7 @@ 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;
@@ -294,7 +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;