Add callback when queueing frame on Surface to create backpressure.

cc/surfaces/surface_factory.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_SURFACE_FACTORY_H_
 #define CC_SURFACES_SURFACE_FACTORY_H_
 
+#include "base/callback_forward.h"
 #include "base/containers/scoped_ptr_hash_map.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/surfaces/surface_id.h"
 #include "cc/surfaces/surface_resource_holder.h"
 #include "cc/surfaces/surfaces_export.h"
 
 namespace gfx {
 class Size;
 }
@@ skipping 12 matching lines @@
 class CC_SURFACES_EXPORT SurfaceFactory
     : public base::SupportsWeakPtr<SurfaceFactory> {
  public:
   SurfaceFactory(SurfaceManager* manager, SurfaceFactoryClient* client);
   ~SurfaceFactory();
 
   void Create(SurfaceId surface_id, const gfx::Size& size);
   void Destroy(SurfaceId surface_id);
   // A frame can only be submitted to a surface created by this factory,
   // although the frame may reference surfaces created by other factories.
-  void SubmitFrame(SurfaceId surface_id, scoped_ptr<CompositorFrame> frame);
+  void SubmitFrame(SurfaceId surface_id,

[jamesr, 2014/08/22 06:00:12]

can you document when the callback fires?

+                   scoped_ptr<CompositorFrame> frame,
+                   const base::Closure& callback);
 
   SurfaceFactoryClient* client() { return client_; }
 
   void ReceiveFromChild(const TransferableResourceArray& resources);
   void RefResources(const TransferableResourceArray& resources);
   void UnrefResources(const ReturnedResourceArray& resources);
 
  private:
   SurfaceManager* manager_;
   SurfaceFactoryClient* client_;
   typedef base::ScopedPtrHashMap<SurfaceId, Surface> OwningSurfaceMap;
   base::ScopedPtrHashMap<SurfaceId, Surface> surface_map_;
 
   SurfaceResourceHolder holder_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceFactory);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_FACTORY_H_