Deliver IPC messages together with SwapCompositorFrame

content/renderer/gpu/mailbox_output_surface.h

 // Copyright (c) 2012 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 CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
 #define CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_
 
 #include <queue>
 
+#include "base/memory/ref_counted.h"
 #include "cc/resources/resource_format.h"
 #include "cc/resources/transferable_resource.h"
 #include "content/renderer/gpu/compositor_output_surface.h"
 #include "ui/gfx/size.h"
 
 namespace cc {
 class CompositorFrameAck;
 }
 
 namespace content {
+class FrameSwapMessageQueue;
 
 // Implementation of CompositorOutputSurface that renders to textures which
 // are sent to the browser through the mailbox extension.
 // This class can be created only on the main thread, but then becomes pinned
 // to a fixed thread when bindToClient is called.
 class MailboxOutputSurface : public CompositorOutputSurface {
  public:
   MailboxOutputSurface(
       int32 routing_id,
       uint32 output_surface_id,
       const scoped_refptr<ContextProviderCommandBuffer>& context_provider,
       scoped_ptr<cc::SoftwareOutputDevice> software_device,
+      scoped_refptr<FrameSwapMessageQueue> swap_frame_message_queue,
       cc::ResourceFormat format);
   virtual ~MailboxOutputSurface();
 
   // cc::OutputSurface implementation.
   virtual void EnsureBackbuffer() OVERRIDE;
   virtual void DiscardBackbuffer() OVERRIDE;
   virtual void Reshape(const gfx::Size& size, float scale_factor) OVERRIDE;
   virtual void BindFramebuffer() OVERRIDE;
   virtual void SwapBuffers(cc::CompositorFrame* frame) OVERRIDE;
 
@@ skipping 23 matching lines @@
   std::queue<TransferableFrame> returned_textures_;
 
   uint32 fbo_;
   bool is_backbuffer_discarded_;
   cc::ResourceFormat format_;
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_GPU_MAILBOX_OUTPUT_SURFACE_H_