Webview attributes overhaul.

extensions/renderer/resources/guest_view/web_view_constants.js

 // Copyright (c) 2014 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.
 
 // This module contains constants used in webview.
 
 // Container for the webview constants.
 var WebViewConstants = {
   // Attributes.
   ATTRIBUTE_ALLOWTRANSPARENCY: 'allowtransparency',
   ATTRIBUTE_AUTOSIZE: 'autosize',
   ATTRIBUTE_MAXHEIGHT: 'maxheight',
   ATTRIBUTE_MAXWIDTH: 'maxwidth',
   ATTRIBUTE_MINHEIGHT: 'minheight',
   ATTRIBUTE_MINWIDTH: 'minwidth',
+  ATTRIBUTE_NAME: 'name',
   ATTRIBUTE_PARTITION: 'partition',
+  ATTRIBUTE_SRC: 'src',
+
+  // Internal attribute.
+  ATTRIBUTE_INTERNALINSTANCEID: 'internalinstanceid',
 
   // Error messages.
   ERROR_MSG_ALREADY_NAVIGATED:
       'The object has already navigated, so its partition cannot be changed.',
   ERROR_MSG_CANNOT_INJECT_SCRIPT: '<webview>: ' +
       'Script cannot be injected into content until the page has loaded.',
   ERROR_MSG_CONTENTWINDOW_NOT_AVAILABLE: '<webview>: ' +
       'contentWindow is not available at this time. It will become available ' +
       'when the page has finished loading.',
   ERROR_MSG_INVALID_PARTITION_ATTRIBUTE: 'Invalid partition attribute.'
 };
 
 exports.WebViewConstants = WebViewConstants;