Browser side support (sans UI) for desktop notifications....

chrome/common/render_messages_internal.h

 // Copyright (c) 2009 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.
 
 // This header is meant to be included in multiple passes, hence no traditional
 // header guard.
 // See ipc_message_macros.h for explanation of the macros and passes.
 
 #include <map>
 #include <string>
@@ skipping 1683 matching lines @@
                       int /* notification_id */)
   IPC_MESSAGE_ROUTED5(ViewHostMsg_ShowDesktopNotificationText,
                       GURL /* origin */,
                       GURL /* icon_url */,
                       string16 /* title */,
                       string16 /* text */,
                       int /* notification_id */)
   IPC_MESSAGE_ROUTED1(ViewHostMsg_CancelDesktopNotification,
                       int /* notification_id */ )
   IPC_MESSAGE_ROUTED2(ViewHostMsg_RequestNotificationPermission,
-                      string16 /* origin */,
+                      GURL /* origin */,
                       int /* callback_context */)
   IPC_SYNC_MESSAGE_ROUTED1_1(ViewHostMsg_CheckNotificationPermission,
-                             string16 /* origin */,
+                             GURL /* origin */,
                              int /* permission_result */)
 
   // Sent if the worker object has sent a ViewHostMsg_CreateDedicatedWorker
   // message and not received a ViewMsg_DedicatedWorkerCreated reply, but in the
   // mean time it's destroyed.  This tells the browser to not create the queued
   // worker.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_CancelCreateDedicatedWorker,
                        int /* route_id */)
 
   // Wraps an IPC message that's destined to the worker on the renderer->browser
@@ skipping 194 matching lines @@
                        int /* socket_id */,
                        std::vector<char> /* data */)
 
   // Request to close the Socket Stream.
   // The browser will send ViewMsg_SocketStream_Closed back when the Socket
   // Stream is completely closed.
   IPC_MESSAGE_CONTROL1(ViewHostMsg_SocketStream_Close,
                        int /* socket_id */)
 
 IPC_END_MESSAGES(ViewHost)