A proposal and implementation for an initial postMessage interface. These in...

ppapi/cpp/instance.h

Index: ppapi/cpp/instance.h
===================================================================
--- ppapi/cpp/instance.h	(revision 78988)
+++ ppapi/cpp/instance.h	(working copy)
@@ -96,6 +96,16 @@
 
   /** See PPB_Instance.ExecuteScript. */
   Var ExecuteScript(const Var& script, Var* exception = NULL);
+
+  // These functions use the PPP_Messaging and PPB_Messaging interfaces, so that
+  // messaging can be done conveniently for a pp::Instance without using a
+  // separate C++ class.
+
+  /** See PPP_Messaging.HandleMessage. */
+  virtual void HandleMessage(const Var& message_data);
+  /** See PPB_Messaging.PostMessage. */
+  void PostMessage(const Var& message);
+
   // @}
 
   /**