Browser Plugin: Add HTML5-like postMessage support

content/browser/browser_plugin/browser_plugin_embedder.h

Index: content/browser/browser_plugin/browser_plugin_embedder.h
diff --git a/content/browser/browser_plugin/browser_plugin_embedder.h b/content/browser/browser_plugin/browser_plugin_embedder.h
index 2d5f3265b2beb67f99a37077c2971b464ea6fa3e..a91357706eebff2ac5d228a753b2fab4e41c75b1 100644
--- a/content/browser/browser_plugin/browser_plugin_embedder.h
+++ b/content/browser/browser_plugin/browser_plugin_embedder.h
@@ -104,6 +104,12 @@ class CONTENT_EXPORT BrowserPluginEmbedder : public WebContentsObserver,
                         const WebKit::WebInputEvent& event,
                         IPC::Message* reply_message);
   void PluginDestroyed(int instance_id);
+  // Called when the embedder posts a message to the guest.
+  void RouteMessageEvent(int instance_id,
+                         const string16& data,
+                         int source_frame_id,
+                         const string16& target_origin,
+                         int target_frame_id);
 
   // Overrides factory for testing. Default (NULL) value indicates regular
   // (non-test) environment.