Fix message routing for BrowserPlugin in iframe

content/browser/browser_plugin/browser_plugin_guest.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.
 
 // A BrowserPluginGuest is the browser side of a browser <--> embedder
 // renderer channel. A BrowserPlugin (a WebPlugin) is on the embedder
 // renderer side of browser <--> embedder renderer communication.
 //
 // BrowserPluginGuest lives on the UI thread of the browser process. Any
 // messages about the guest render process that the embedder might be interested
@@ skipping 153 matching lines @@
   void RenderProcessGone(base::TerminationStatus status) override;
   bool OnMessageReceived(const IPC::Message& message) override;
   bool OnMessageReceived(const IPC::Message& message,
                          RenderFrameHost* render_frame_host) override;
 
   // Exposes the protected web_contents() from WebContentsObserver.
   WebContentsImpl* GetWebContents() const;
 
   gfx::Point GetScreenCoordinates(const gfx::Point& relative_position) const;
 
-  // Helper to send messages to embedder. This methods fills the message with
-  // the correct routing id.
+  // Helper to send messages to embedder. If this guest is not yet attached,
+  // then IPCs will be queued until attachment.
   void SendMessageToEmbedder(IPC::Message* msg);
 
   // Returns whether the guest is attached to an embedder.
   bool attached() const { return attached_; }
 
   // Attaches this BrowserPluginGuest to the provided |embedder_web_contents|
   // and initializes the guest with the provided |params|. Attaching a guest
   // to an embedder implies that this guest's lifetime is no longer managed
   // by its opener, and it can begin loading resources.
   void Attach(int browser_plugin_instance_id,
@@ skipping 214 matching lines @@
   // Weak pointer used to ask GeolocationPermissionContext about geolocation
   // permission.
   base::WeakPtrFactory<BrowserPluginGuest> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserPluginGuest);
 };
 
 }  // namespace content
 
 #endif  // CONTENT_BROWSER_BROWSER_PLUGIN_BROWSER_PLUGIN_GUEST_H_