cc: Add SetNeedsOneBeginImplFrame to the Scheduler

cc/scheduler/scheduler.h

 // Copyright 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef CC_SCHEDULER_SCHEDULER_H_
 #define CC_SCHEDULER_SCHEDULER_H_
 
 #include <deque>
 #include <string>
 
@@ skipping 66 matching lines @@
 
   void SetVisible(bool visible);
   bool visible() { return state_machine_.visible(); }
   void SetResourcelessSoftareDraw(bool resourceless_draw);
   void SetCanDraw(bool can_draw);
   void NotifyReadyToActivate();
   void NotifyReadyToDraw();
   void SetThrottleFrameProduction(bool throttle);
 
   void SetNeedsBeginMainFrame();
+  // Requests a single impl frame (after the current frame if there is one
+  // active).
+  void SetNeedsOneBeginImplFrame();
 
   void SetNeedsRedraw();
 
   void SetNeedsAnimate();
 
   void SetNeedsPrepareTiles();
 
   void SetMaxSwapsPending(int max);
   void DidSwapBuffers();
   void DidSwapBuffersComplete();
@@ skipping 125 matching lines @@
   }
 
   base::WeakPtrFactory<Scheduler> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(Scheduler);
 };
 
 }  // namespace cc
 
 #endif  // CC_SCHEDULER_SCHEDULER_H_