PPAPI: Implement synchronous postMessage

ppapi/c/ppb_messaging.h

Index: ppapi/c/ppb_messaging.h
diff --git a/ppapi/c/ppb_messaging.h b/ppapi/c/ppb_messaging.h
index 21c8467d5f5bb6b00f8e4e179076c07b9740bbf8..a363fd7eb5615c30e71568e0f09a03b3fbed03c9 100644
--- a/ppapi/c/ppb_messaging.h
+++ b/ppapi/c/ppb_messaging.h
@@ -3,7 +3,7 @@
  * found in the LICENSE file.
  */
 
-/* From ppb_messaging.idl modified Mon Jun  2 11:00:28 2014. */
+/* From ppb_messaging.idl modified Tue Jun  3 13:57:21 2014. */
 
 #ifndef PPAPI_C_PPB_MESSAGING_H_
 #define PPAPI_C_PPB_MESSAGING_H_
@@ -100,9 +100,6 @@ struct PPB_Messaging_1_1 { /* dev */
    */
   void (*PostMessage)(PP_Instance instance, struct PP_Var message);
   /**
-   * <strong>Note:</strong> This function is not yet implemented. Please use
-   * PPB_Messaging_1_0.
-   *
    * Registers a handler for receiving messages from JavaScript. If a handler
    * is registered this way, it will replace PPP_Messaging, and all messages
    * sent from JavaScript via postMessage and postMessageAndAwaitResponse will
@@ -137,9 +134,6 @@ struct PPB_Messaging_1_1 { /* dev */
       const struct PPP_MessageHandler_0_1* handler,
       PP_Resource message_loop);
   /**
-   * <strong>Note:</strong> This function is not yet implemented. Please use
-   * PPB_Messaging_1_0.
-   *
    * Unregisters the current message handler for <code>instance</code> if one
    * is registered. After this call, the message handler (if one was
    * registered) will have "Destroy" called on it and will receive no further