[extension SW]: Support event listener registration and event dispatching.

extensions/common/extension_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 extensions.
 // Multiply-included message file, hence no include guard.
 
 #include <stdint.h>
 
 #include <string>
@@ skipping 102 matching lines @@
   // If this API call is for a service worker, then this is the worker thread
   // id. Otherwise, this is -1.
   IPC_STRUCT_MEMBER(int, worker_thread_id)
 
   // If this API call is for a service worker, then this is the service
   // worker version id. Otherwise, this is -1.
   IPC_STRUCT_MEMBER(int64_t, service_worker_version_id)
 IPC_STRUCT_END()
 
 IPC_STRUCT_BEGIN(ExtensionMsg_DispatchEvent_Params)
+  // If this event is for a service worker, then this is the worker thread
+  // id. Otherwise, this is 0.
+  IPC_STRUCT_MEMBER(int, worker_thread_id)
+
   // The id of the extension to dispatch the event to.
   IPC_STRUCT_MEMBER(std::string, extension_id)
 
   // The name of the event to dispatch.
   IPC_STRUCT_MEMBER(std::string, event_name)
 
   // The id of the event for use in the EventAck response message.
   IPC_STRUCT_MEMBER(int, event_id)
 
   // Whether or not the event is part of a user gesture.
@@ skipping 539 matching lines @@
 IPC_MESSAGE_ROUTED1(ExtensionHostMsg_Request,
                     ExtensionHostMsg_Request_Params)
 
 // A renderer sends this message when an extension process starts an API
 // request. The browser will always respond with a ExtensionMsg_Response.
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_RequestForIOThread,
                      int /* routing_id */,
                      ExtensionHostMsg_Request_Params)
 
 // Notify the browser that the given extension added a listener to an event.
-IPC_MESSAGE_CONTROL3(ExtensionHostMsg_AddListener,
+IPC_MESSAGE_CONTROL4(ExtensionHostMsg_AddListener,
                      std::string /* extension_id */,
                      GURL /* listener_url */,
-                     std::string /* name */)
+                     std::string /* name */,
+                     int /* worker_thread_id */)
 
 // Notify the browser that the given extension removed a listener from an
 // event.
-IPC_MESSAGE_CONTROL3(ExtensionHostMsg_RemoveListener,
+IPC_MESSAGE_CONTROL4(ExtensionHostMsg_RemoveListener,
                      std::string /* extension_id */,
                      GURL /* listener_url */,
-                     std::string /* name */)
+                     std::string /* name */,
+                     int /* worker_thread_id */)
 
 // Notify the browser that the given extension added a listener to an event from
 // a lazy background page.
-IPC_MESSAGE_CONTROL2(ExtensionHostMsg_AddLazyListener,
+IPC_MESSAGE_CONTROL3(ExtensionHostMsg_AddLazyListener,
                      std::string /* extension_id */,
-                     std::string /* name */)
+                     std::string /* name */,
+                     int /* worker_thread_id */)
 
 // Notify the browser that the given extension is no longer interested in
 // receiving the given event from a lazy background page.
-IPC_MESSAGE_CONTROL2(ExtensionHostMsg_RemoveLazyListener,
+IPC_MESSAGE_CONTROL3(ExtensionHostMsg_RemoveLazyListener,
                      std::string /* extension_id */,
-                     std::string /* name */)
+                     std::string /* name */,
+                     int /* worker_thread_id */)
 
 // Notify the browser that the given extension added a listener to instances of
 // the named event that satisfy the filter.
 IPC_MESSAGE_CONTROL4(ExtensionHostMsg_AddFilteredListener,
                      std::string /* extension_id */,
                      std::string /* name */,
                      base::DictionaryValue /* filter */,
                      bool /* lazy */)
 
 // Notify the browser that the given extension is no longer interested in
@@ skipping 220 matching lines @@
                      int64_t /* service_worker_version_id */,
                      std::string /* request_uuid */)
 
 // Asks the browser to decrement the pending activity count for
 // the worker with version id |service_worker_version_id|.
 // |request_uuid| must match the GUID of a previous request, otherwise the
 // browser process ignores the IPC.
 IPC_MESSAGE_CONTROL2(ExtensionHostMsg_DecrementServiceWorkerActivity,
                      int64_t /* service_worker_version_id */,
                      std::string /* request_uuid */)