Extend contextMenus API to support browser/page actions

chrome/common/extensions/api/context_menus.json

 // 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.
 
 [
   {
     "namespace": "contextMenus",
     "description": "Use the <code>chrome.contextMenus</code> API to add items to Google Chrome's context menu. You can choose what types of objects your context menu additions apply to, such as images, hyperlinks, and pages.",
     "functions": [
       {
@@ skipping 30 matching lines @@
               },
               "checked": {
                 "type": "boolean",
                 "optional": true,
                 "description": "The initial state of a checkbox or radio item: true for selected and false for unselected. Only one radio item can be selected at a time in a given group of radio items."
               },
               "contexts": {
                 "type": "array",
                 "items": {
                   "type": "string",
-                  "enum": ["all", "page", "frame", "selection", "link", "editable", "image", "video", "audio", "launcher"]
+                  "enum": ["all", "page", "frame", "selection", "link", "editable", "image", "video", "audio", "launcher", "browser_action", "page_action"]
                 },
                 "minItems": 1,
                 "optional": true,
                 "description": "List of contexts this menu item will appear in. Defaults to ['page'] if not specified. Specifying ['all'] is equivalent to the combination of all other contexts except for 'launcher'. The 'launcher' context is only supported by apps and is used to add menu items to the context menu that appears when clicking on the app icon in the launcher/taskbar/dock/etc. Different platforms might put limitations on what is actually supported in a launcher context menu."
               },
               "onclick": {
                 "type": "function",
                 "optional": true,
                 "description": "A function that will be called back when the menu item is clicked. Event pages cannot use this; instead, they should register a listener for chrome.contextMenus.onClicked.",
                 "parameters": [
@@ skipping 74 matching lines @@
                 "optional": true
               },
               "checked": {
                 "type": "boolean",
                 "optional": true
               },
               "contexts": {
                 "type": "array",
                 "items": {
                   "type": "string",
-                  "enum": ["all", "page", "frame", "selection", "link", "editable", "image", "video", "audio", "launcher"]
+                  "enum": ["all", "page", "frame", "selection", "link", "editable", "image", "video", "audio", "launcher", "browser_action", "page_action"]
                 },
                 "minItems": 1,
                 "optional": true
               },
               "onclick": {
                 "type": "function",
                 "optional": true
               },
               "parentId": {
                 "choices": [
@@ skipping 67 matching lines @@
     ],
     "events": [
       {
         "name": "onClicked",
         "type": "function",
         "$ref": "contextMenusInternal.onClicked"
       }
     ]
   }
 ]