Use gpu::Mailbox instead of std:string in IPCs

content/renderer/child_frame_compositing_helper.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 CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_
 #define CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 51 matching lines @@
       RenderFrameImpl* render_frame,
       int host_routing_id);
 
   void CopyFromCompositingSurface(int request_id,
                                   gfx::Rect source_rect,
                                   gfx::Size dest_size);
   void DidCommitCompositorFrame();
   void EnableCompositing(bool);
   void OnContainerDestroy();
   void OnBuffersSwapped(const gfx::Size& size,
-                        const std::string& mailbox_name,
+                        const gpu::Mailbox& mailbox,
                         int gpu_route_id,
                         int gpu_host_id,
                         float device_scale_factor);
   void OnCompositorFrameSwapped(scoped_ptr<cc::CompositorFrame> frame,
                                 int route_id,
                                 uint32 output_surface_id,
                                 int host_id);
   void UpdateVisibility(bool);
   void ChildFrameGone();
 
@@ skipping 79 matching lines @@
 
   base::WeakPtr<BrowserPlugin> browser_plugin_;
   RenderFrameImpl* render_frame_;
 
   DISALLOW_COPY_AND_ASSIGN(ChildFrameCompositingHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_RENDERER_CHILD_FRAME_COMPOSITING_HELPER_H_