Browser Plugin: Update Guest WebContents Visibility on BrowserPlugin Visiblity Change.

content/browser/browser_plugin/browser_plugin_embedder_helper.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_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_HELPER_H_
 #define CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_HELPER_H_
 
 #include <string>
 
 #include "base/compiler_specific.h"
@@ skipping 49 matching lines @@
   void OnResizeGuest(int instance_id,
                      const BrowserPluginHostMsg_ResizeGuest_Params& params);
   void OnUpdateRectACK(int instance_id, int message_id, const gfx::Size& size);
   void OnHandleInputEvent(const IPC::SyncMessage& message, bool* handled);
   void OnSetFocus(int instance_id, bool focused);
   void OnPluginDestroyed(int instance_id);
   void OnGo(int instance_id, int relative_index);
   void OnStop(int instance_id);
   void OnReload(int instance_id);
   void OnTerminateGuest(int instance_id);
+  void OnSetGuestVisibility(int instance_id, bool visible);
 
   BrowserPluginEmbedder* embedder_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginEmbedderHelper);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_EMBEDDER_HELPER_H_