Another stab at the Chromium side of storage events. The WebKit side can be ...

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 716 matching lines @@
   // Returns the attributes of a file
   IPC_MESSAGE_CONTROL2(ViewMsg_DatabaseGetFileAttributesResponse,
                        int32 /* the ID of the message we're replying to */,
                        int32 /* the attributes for the given DB file */)
 
   // Returns the size of a file
   IPC_MESSAGE_CONTROL2(ViewMsg_DatabaseGetFileSizeResponse,
                        int32 /* the ID of the message we're replying to */,
                        int64 /* the size of the given DB file */)
 
+  // Storage events are broadcast to renderer processes.
+  IPC_MESSAGE_CONTROL5(ViewMsg_DOMStorageEvent,
+                       string16 /* key */,
+                       NullableString16 /* old_value */,
+                       NullableString16 /* new_value */,
+                       string16 /* origin */,
+                       DOMStorageType /* dom_storage_type */)
+
 #if defined(IPC_MESSAGE_LOG_ENABLED)
   // Tell the renderer process to begin or end IPC message logging.
   IPC_MESSAGE_CONTROL1(ViewMsg_SetIPCLoggingEnabled,
                        bool /* on or off */)
 #endif
 
   //---------------------------------------------------------------------------
   // Utility process messages:
   // These are messages from the browser to the utility process.  They're here
   // because we ran out of spare message types.
@@ skipping 1033 matching lines @@
   IPC_MESSAGE_CONTROL2(ViewHostMsg_DatabaseGetFileAttributes,
                        FilePath /* the name of the file */,
                        int32 /* a unique message ID */)
 
   // Asks the browser process to return the size of a DB file
   IPC_MESSAGE_CONTROL2(ViewHostMsg_DatabaseGetFileSize,
                        FilePath /* the name of the file */,
                        int32 /* a unique message ID */)
 
 IPC_END_MESSAGES(ViewHost)