Fix message routing for BrowserPlugin in iframe

content/public/renderer/browser_plugin_delegate.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_PUBLIC_RENDERER_BROWSER_PLUGIN_DELEGATE_H_
 #define CONTENT_PUBLIC_RENDERER_BROWSER_PLUGIN_DELEGATE_H_
 
 #include <string>
 
 #include "content/common/content_export.h"
+#include "ipc/ipc_message.h"
 
 namespace content {
 
 class RenderFrame;
 
 // A delegate for BrowserPlugin which gets notified about the plugin load.
 // Implementations can provide additional steps necessary to change the load
 // behavior of the plugin.
 class CONTENT_EXPORT BrowserPluginDelegate {
  public:
   virtual ~BrowserPluginDelegate() {}
 
   // Called when the BrowserPlugin's geometry has been computed for the first
   // time.
   virtual void Ready() {}
 
   // Called when plugin document has finished loading.
   virtual void DidFinishLoading() {}
 
   // Called when plugin document receives data.
   virtual void DidReceiveData(const char* data, int data_length) {}
 
   // Sets the instance ID that idenfies the plugin within current render
   // process.
   virtual void SetElementInstanceID(int element_instance_id) {}
+
+  // Called when a message is received.  Returns true iff the message was
+  // handled.
+  virtual bool OnMessageReceived(const IPC::Message& message);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_PUBLIC_RENDERER_BROWSER_PLUGIN_DELEGATE_H_