Wire provider_id into scriptable API provider to start listening events

content/common/service_worker/service_worker_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.
 
 // Message definition file, included multiple times, hence no include guard.
 
 #include "base/strings/string16.h"
 #include "content/common/service_worker/service_worker_status_code.h"
 #include "content/common/service_worker/service_worker_types.h"
 #include "ipc/ipc_message_macros.h"
@@ skipping 66 matching lines @@
 
 // Informs the browser of a new ServiceWorkerProvider in the child process,
 // |provider_id| is unique within its child process.
 IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_ProviderCreated,
                      int /* provider_id */)
 
 // Informs the browser of a ServiceWorkerProvider being destroyed.
 IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_ProviderDestroyed,
                      int /* provider_id */)
 
+// Informs the browser of a new scriptable API client in the child process.
+IPC_MESSAGE_CONTROL2(ServiceWorkerHostMsg_AddScriptClient,
+                     int /* thread_id */,
+                     int /* provider_id */)
+
+// Informs the browser that the scriptable API client is unregistered.
+IPC_MESSAGE_CONTROL2(ServiceWorkerHostMsg_RemoveScriptClient,
+                     int /* thread_id */,
+                     int /* provider_id */)
+
 // Informs the browser that install event handling has finished.
 // Sent via EmbeddedWorker. If there was an exception during the
 // event handling it'll be reported back separately (to be propagated
 // to the documents).
 IPC_MESSAGE_CONTROL0(ServiceWorkerHostMsg_InstallEventFinished)
 
   // Informs the browser that fetch event handling has finished.
 IPC_MESSAGE_CONTROL1(ServiceWorkerHostMsg_FetchEventFinished,
                      content::ServiceWorkerFetchResponse)