Browser Plugin: Add HTML5-like postMessage support

content/renderer/browser_plugin/browser_plugin.h

Index: content/renderer/browser_plugin/browser_plugin.h
diff --git a/content/renderer/browser_plugin/browser_plugin.h b/content/renderer/browser_plugin/browser_plugin.h
index 29f9b6dc55798dafa0286f5266877d4e6bdaa855..dd32e88de3822311f2b65516a56ff91a6de28bfc 100644
--- a/content/renderer/browser_plugin/browser_plugin.h
+++ b/content/renderer/browser_plugin/browser_plugin.h
@@ -47,6 +47,13 @@ class CONTENT_EXPORT BrowserPlugin :
   // Tells the BrowserPlugin to advance the focus to the next (or previous)
   // element.
   void AdvanceFocus(bool reverse);
+  // Tell the BrowserPlugin to post a message to its guest.
+  void PostMessage(const string16& message,
+                   const string16& target_origin);
+  // Inform the BrowserPlugin of a message posted from its guest.
+  void ReceiveMessage(int source_routing_id,
+                      const string16& source_origin,
+                      const string16& data);
 
   // Indicates whether there are any Javascript listeners attached to a
   // provided event_name.