cc: Use multiple PrepareTiles approaches

cc/scheduler/scheduler.h

Index: cc/scheduler/scheduler.h
diff --git a/cc/scheduler/scheduler.h b/cc/scheduler/scheduler.h
index 13daf008cc338935212784a6e4b188215ce54b2e..dbd9dca36a3bf61746fef6145f5d798cd7405fa9 100644
--- a/cc/scheduler/scheduler.h
+++ b/cc/scheduler/scheduler.h
@@ -108,6 +108,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void SetCanDraw(bool can_draw);
   void NotifyReadyToActivate();
   void NotifyReadyToDraw();
+  void SetRequiresHighResToDraw(bool required);
   void SetThrottleFrameProduction(bool throttle);
 
   void SetNeedsCommit();
@@ -116,7 +117,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
 
   void SetNeedsAnimate();
 
-  void SetNeedsPrepareTiles();
+  void SetNeedsPrepareTiles(bool for_commit);
 
   void SetWaitForReadyToDraw();
 
@@ -129,7 +130,6 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void NotifyReadyToCommit();
   void BeginMainFrameAborted(CommitEarlyOutReason reason);
 
-  void DidPrepareTiles();
   void DidLoseOutputSurface();
   void DidCreateAndInitializeOutputSurface();
 
@@ -228,6 +228,7 @@ class CC_EXPORT Scheduler : public BeginFrameObserverMixIn {
   void PostBeginRetroFrameIfNeeded();
   void SetupPollingMechanisms();
   void DrawAndSwapIfPossible();
+  void DrawAndSwapForced();
   void ProcessScheduledActions();
   bool CanCommitAndActivateBeforeDeadline() const;
   void AdvanceCommitStateIfPossible();