Add support for a "frame" context option to chrome.contextMenus.create/update.

chrome/browser/extensions/extension_menu_manager.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_BROWSER_EXTENSIONS_EXTENSION_MENU_MANAGER_H_
 #define CHROME_BROWSER_EXTENSIONS_EXTENSION_MENU_MANAGER_H_
 #pragma once
 
 #include <map>
 #include <set>
@@ skipping 40 matching lines @@
   // For context menus, these are the contexts where an item can appear.
   enum Context {
     ALL = 1,
     PAGE = 2,
     SELECTION = 4,
     LINK = 8,
     EDITABLE = 16,
     IMAGE = 32,
     VIDEO = 64,
     AUDIO = 128,
+    FRAME = 256,
   };
 
   // An item can be only one of these types.
   enum Type {
     NORMAL,
     CHECKBOX,
     RADIO,
     SEPARATOR
   };
 
@@ skipping 207 matching lines @@
   std::map<ExtensionMenuItem::Id, ExtensionMenuItem*> items_by_id_;
 
   NotificationRegistrar registrar_;
 
   ExtensionIconManager icon_manager_;
 
   DISALLOW_COPY_AND_ASSIGN(ExtensionMenuManager);
 };
 
 #endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_MENU_MANAGER_H_