Add offline_mode support in crxless apps

chrome/common/extensions/extension_messages.h

 // Copyright (c) 2012 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 74 matching lines @@
   IPC_STRUCT_TRAITS_MEMBER(data)
 IPC_STRUCT_TRAITS_END()
 
 IPC_STRUCT_TRAITS_BEGIN(WebApplicationInfo)
   IPC_STRUCT_TRAITS_MEMBER(title)
   IPC_STRUCT_TRAITS_MEMBER(description)
   IPC_STRUCT_TRAITS_MEMBER(app_url)
   IPC_STRUCT_TRAITS_MEMBER(icons)
   IPC_STRUCT_TRAITS_MEMBER(permissions)
   IPC_STRUCT_TRAITS_MEMBER(launch_container)
+  IPC_STRUCT_TRAITS_MEMBER(is_offline_enabled)
 IPC_STRUCT_TRAITS_END()
 
 // Singly-included section for custom IPC traits.
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_MESSAGES_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_MESSAGES_H_
 
 // IPC_MESSAGE macros choke on extra , in the std::map, when expanding. We need
 // to typedef it to avoid that.
 // Substitution map for l10n messages.
 typedef std::map<std::string, std::string> SubstitutionMap;
@@ skipping 370 matching lines @@
 // alive.
 IPC_MESSAGE_ROUTED0(ExtensionHostMsg_DecrementLazyKeepaliveCount)
 
 // Fetches a globally unique ID (for the lifetime of the browser) from the
 // browser process.
 IPC_SYNC_MESSAGE_CONTROL0_1(ExtensionHostMsg_GenerateUniqueID,
                             int /* unique_id */)
 
 // Resumes resource requests for a newly created app window.
 IPC_MESSAGE_CONTROL1(ExtensionHostMsg_ResumeRequests, int /* route_id */)