Add offline_enabled field in manifest.

chrome/common/extensions/extension_constants.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.
 
 #ifndef CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #define CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_
 #pragma once
 
 #include "base/basictypes.h"
 
@@ skipping 35 matching lines @@
   extern const char* kLaunchLocalPath;
   extern const char* kLaunchWebURL;
   extern const char* kLaunchWidth;
   extern const char* kLayouts;
   extern const char* kMatches;
   extern const char* kMinimumChromeVersion;
   extern const char* kNaClModules;
   extern const char* kNaClModulesMIMEType;
   extern const char* kNaClModulesPath;
   extern const char* kName;
+  extern const char* kOfflineEnabled;
   extern const char* kOmnibox;
   extern const char* kOmniboxKeyword;
   extern const char* kOptionalPermissions;
   extern const char* kOptionsPage;
   extern const char* kPageAction;
   extern const char* kPageActionDefaultIcon;
   extern const char* kPageActionDefaultPopup;
   extern const char* kPageActionDefaultTitle;
   extern const char* kPageActionIcons;
   extern const char* kPageActionId;
@@ skipping 120 matching lines @@
   extern const char* kInvalidLaunchWidthContainer;
   extern const char* kInvalidManifest;
   extern const char* kInvalidMatch;
   extern const char* kInvalidMatchCount;
   extern const char* kInvalidMatches;
   extern const char* kInvalidMinimumChromeVersion;
   extern const char* kInvalidNaClModules;
   extern const char* kInvalidNaClModulesMIMEType;
   extern const char* kInvalidNaClModulesPath;
   extern const char* kInvalidName;
+  extern const char* kInvalidOfflineEnabled;
   extern const char* kInvalidOmniboxKeyword;
   extern const char* kInvalidOptionsPage;
   extern const char* kInvalidOptionsPageExpectUrlInPackage;
   extern const char* kInvalidOptionsPageInHostedApp;
   extern const char* kInvalidPageAction;
   extern const char* kInvalidPageActionDefaultTitle;
   extern const char* kInvalidPageActionIconPath;
   extern const char* kInvalidPageActionId;
   extern const char* kInvalidPageActionName;
   extern const char* kInvalidPageActionOldAndNewKeys;
@@ skipping 206 matching lines @@
   };
 
   enum UnloadedExtensionReason {
     UNLOAD_REASON_DISABLE,    // Extension is being disabled.
     UNLOAD_REASON_UPDATE,     // Extension is being updated to a newer version.
     UNLOAD_REASON_UNINSTALL,  // Extension is being uninstalled.
   };
 }  // extension_misc
 
 #endif  // CHROME_COMMON_EXTENSIONS_EXTENSION_CONSTANTS_H_