Insert default stylesheet for platform apps.

chrome/common/extensions/extension_messages.h

 // Copyright (c) 2011 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 "base/shared_memory.h"
 #include "base/values.h"
 #include "chrome/common/extensions/extension.h"
@@ skipping 180 matching lines @@
                      std::string /* extension_id */)
 
 // Marks an application as 'active' in a process.
 IPC_MESSAGE_CONTROL1(ExtensionMsg_ActivateApplication,
                      std::string /* extension_id */)
 
 // Notifies the renderer that an extension was loaded in the browser.
 IPC_MESSAGE_CONTROL1(ExtensionMsg_Loaded,
                      ExtensionMsg_Loaded_Params)
 
+// Gives the renderer a hint that a sequence of ExtensionMsg_Loaded messages
+// are about to be sent, followed by ExtensionMsg_EndBatchLoad.
+IPC_MESSAGE_CONTROL0(ExtensionMsg_StartBatchLoad)
+
+// Balances ExtensionMsg_StartBatchLoad.
+IPC_MESSAGE_CONTROL0(ExtensionMsg_EndBatchLoad)
+
 // Notifies the renderer that an extension was unloaded in the browser.
 IPC_MESSAGE_CONTROL1(ExtensionMsg_Unloaded,
                      std::string)
 
 // Updates the scripting whitelist for extensions in the render process. This is
 // only used for testing.
 IPC_MESSAGE_CONTROL1(ExtensionMsg_SetScriptingWhitelist,
                      Extension::ScriptingWhitelist /* extenison ids */)
 
 // Notification that renderer should run some JavaScript code.
@@ skipping 140 matching lines @@
 // Response to the renderer for the above message.
 IPC_MESSAGE_ROUTED3(ExtensionMsg_GetAppNotifyChannelResponse,
                     std::string /* channel_id */,
                     std::string /* error */,
                     int32 /* callback_id */)
 
 // Deliver a message sent with ExtensionHostMsg_PostMessage.
 IPC_MESSAGE_ROUTED2(ExtensionMsg_DeliverMessage,
                     int /* target_port_id */,
                     std::string /* message */)