cc: Split animating and drawing into separate actions

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 0d34f036c5831f0525f250c9c51c287223c24f87..1e59192a0f4f06003f1a75e5f5c9fc8b101bdd12 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -33,6 +33,7 @@ class SchedulerClient {
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapIfPossible() = 0;
   virtual DrawSwapReadbackResult ScheduledActionDrawAndSwapForced() = 0;
   virtual DrawSwapReadbackResult ScheduledActionDrawAndReadback() = 0;
+  virtual void ScheduledActionAnimate() = 0;
   virtual void ScheduledActionCommit() = 0;
   virtual void ScheduledActionUpdateVisibleTiles() = 0;
   virtual void ScheduledActionActivatePendingTree() = 0;
@@ -81,6 +82,8 @@ class CC_EXPORT Scheduler {
 
   void SetNeedsRedraw();
 
+  void SetNeedsAnimate();
+
   void SetNeedsManageTiles();
 
   void SetMaxSwapsPending(int max);