Limit outstanding surface draw swaps to max_frames_pending.

cc/surfaces/display.h

 // Copyright 2014 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_SURFACES_DISPLAY_H_
 #define CC_SURFACES_DISPLAY_H_
 
 #include "base/memory/scoped_ptr.h"
 #include "cc/output/output_surface_client.h"
 #include "cc/output/renderer.h"
@@ skipping 29 matching lines @@
  public:
   Display(DisplayClient* client,
           SurfaceManager* manager,
           SharedBitmapManager* bitmap_manager);
   virtual ~Display();
 
   void Resize(SurfaceId id, const gfx::Size& new_size);
   bool Draw();
 
   SurfaceId CurrentSurfaceId();
+  int GetMaxFramesPending();
 
   // OutputSurfaceClient implementation.
   virtual void DeferredInitialize() OVERRIDE {}
   virtual void ReleaseGL() OVERRIDE {}
   virtual void CommitVSyncParameters(base::TimeTicks timebase,
                                      base::TimeDelta interval) OVERRIDE {}
   virtual void SetNeedsRedrawRect(const gfx::Rect& damage_rect) OVERRIDE {}
   virtual void BeginFrame(const BeginFrameArgs& args) OVERRIDE {}
-  virtual void DidSwapBuffers() OVERRIDE {}
-  virtual void DidSwapBuffersComplete() OVERRIDE {}
+  virtual void DidSwapBuffers() OVERRIDE;
+  virtual void DidSwapBuffersComplete() OVERRIDE;
   virtual void ReclaimResources(const CompositorFrameAck* ack) OVERRIDE {}
   virtual void DidLoseOutputSurface() OVERRIDE {}
   virtual void SetExternalDrawConstraints(
       const gfx::Transform& transform,
       const gfx::Rect& viewport,
       const gfx::Rect& clip,
       const gfx::Rect& viewport_rect_for_tile_priority,
       const gfx::Transform& transform_for_tile_priority,
       bool resourceless_software_draw) OVERRIDE {}
   virtual void SetMemoryPolicy(const ManagedMemoryPolicy& policy) OVERRIDE {}
@@ skipping 20 matching lines @@
   scoped_ptr<SurfaceAggregator> aggregator_;
   scoped_ptr<DirectRenderer> renderer_;
   scoped_ptr<BlockingTaskRunner> blocking_main_thread_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(Display);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_DISPLAY_H_