Update IPC browser_plugin_instance_id before sending queued messages

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 368 matching lines @@
   void OnShowWidget(int route_id, const gfx::Rect& initial_rect);
   void OnTakeFocus(bool reverse);
   void OnUpdateFrameName(int frame_id,
                          bool is_top_level,
                          const std::string& name);
 
   // Called when WillAttach is complete.
   void OnWillAttachComplete(WebContentsImpl* embedder_web_contents,
                             const BrowserPluginHostMsg_Attach_Params& params);
 
+  // Returns identical message with current browser_plugin_instance_id() if
+  // the input was created with browser_plugin::kInstanceIdNone, else it returns
+  // the input message unmodified. If no current browser_plugin_instance_id()
+  // is set, or anything goes wrong, the input message is returned.
+  IPC::Message* UpdateInstanceIdIfNecessary(IPC::Message* msg) const;
+
   // Forwards all messages from the |pending_messages_| queue to the embedder.
   void SendQueuedMessages();
 
   void SendTextInputTypeChangedToView(RenderWidgetHostViewBase* guest_rwhv);
 
   // The last tooltip that was set with SetTooltipText().
   base::string16 current_tooltip_text_;
 
   scoped_ptr<EmbedderVisibilityObserver> embedder_visibility_observer_;
   WebContentsImpl* owner_web_contents_;
@@ skipping 67 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_