Dispatch push event to worker from PushServiceImpl#OnMessage.

content/common/push_messaging_messages.h

 // Copyright 2014 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.
 
 // IPC messages for push messaging.
 // Multiply-included message file, hence no include guard.
 
 #include "ipc/ipc_message_macros.h"
 #include "url/gurl.h"
 
 #define IPC_MESSAGE_START PushMessagingMsgStart
 
 // Messages sent from the browser to the renderer.
 
 IPC_MESSAGE_ROUTED3(PushMessagingMsg_RegisterSuccess,
                     int32 /* callbacks_id */,
                     GURL /* endpoint */,
-                    std::string /* registration_id */)
+                    std::string /* push_registration_id */)
 
 IPC_MESSAGE_ROUTED1(PushMessagingMsg_RegisterError,
                     int32 /* callbacks_id */)
 
 // Messages sent from the renderer to the browser.
 
-IPC_MESSAGE_CONTROL3(PushMessagingHostMsg_Register,
+IPC_MESSAGE_CONTROL5(PushMessagingHostMsg_Register,
                      int32 /* routing_id */,
                      int32 /* callbacks_id */,
-                     std::string /* sender_id */)
+                     std::string /* sender_id */,
+                     GURL /* url of the registering document */,
+                     int32 /* service_worker_provider_id */)