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

content/renderer/browser_plugin/browser_plugin_manager_impl.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_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_IMPL_H_
 #define CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_IMPL_H_
 
 #include "content/renderer/browser_plugin/browser_plugin_manager.h"
 #include "googleurl/src/gurl.h"
 #include "ui/gfx/size.h"
 
 struct BrowserPluginMsg_UpdateRect_Params;
 class WebCursor;
 
 namespace gfx {
 class Point;
 }
 
+namespace gpu {
+struct Mailbox;
+}
+
 namespace content {
 
 class BrowserPluginManagerImpl : public BrowserPluginManager {
  public:
   BrowserPluginManagerImpl(RenderViewImpl* render_view);
 
   // BrowserPluginManager implementation.
   virtual BrowserPlugin* CreateBrowserPlugin(
       RenderViewImpl* render_view,
       WebKit::WebFrame* frame,
@@ skipping 10 matching lines @@
 
   void OnAllocateInstanceIDACK(const IPC::Message& message,
                                int request_id,
                                int instance_id);
   void OnPluginAtPositionRequest(const IPC::Message& message,
                                  int request_id,
                                  const gfx::Point& position);
   void OnUnhandledSwap(const IPC::Message& message,
                        int instance_id,
                        const gfx::Size& size,
-                       std::string mailbox_name,
+                       gpu::Mailbox mailbox_name,
                        int gpu_route_id,
                        int gpu_host_id);
 
   int request_id_counter_;
   IDMap<BrowserPlugin> pending_allocate_instance_id_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginManagerImpl);
 };
 
 }  // namespace content
 
 #endif //  CONTENT_RENDERER_BROWSER_PLUGIN_BROWSER_PLUGIN_MANAGER_IMPL_H_