<webview> + <extensionview>: Create a maybeHandleMutation call into attributes

extensions/renderer/resources/guest_view/web_view_attributes.js

 // Copyright 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 implements the attributes of the <webview> tag.
 
 var GuestViewInternal =
     require('binding').Binding.create('guestViewInternal').generate();
 var WebViewImpl = require('webView').WebViewImpl;
 var WebViewConstants = require('webViewConstants').WebViewConstants;
@@ skipping 35 matching lines @@
       return this.getValue();
     }.bind(this),
     set: function(value) {
       this.setValue(value);
     }.bind(this),
     enumerable: true
   });
 };
 
 // Called when the attribute's value changes.
+WebViewAttribute.prototype.maybeHandleMutation = function(oldValue, newValue) {
+  if (this.ignoreMutation) {
+    return;
+  }
+
+  this.handleMutation(oldValue, newValue);
+};
+
+// Called when a change that isn't ignored occurs to the attribute's value.
 WebViewAttribute.prototype.handleMutation = function(oldValue, newValue) {};
 
 // An attribute that is treated as a Boolean.
 function BooleanAttribute(name, webViewImpl) {
   WebViewAttribute.call(this, name, webViewImpl);
 }
 
 BooleanAttribute.prototype.__proto__ = WebViewAttribute.prototype;
 
 BooleanAttribute.prototype.getValue = function() {
@@ skipping 209 matching lines @@
 
   var autosizeAttributes = [WebViewConstants.ATTRIBUTE_MAXHEIGHT,
                             WebViewConstants.ATTRIBUTE_MAXWIDTH,
                             WebViewConstants.ATTRIBUTE_MINHEIGHT,
                             WebViewConstants.ATTRIBUTE_MINWIDTH];
   for (var i = 0; autosizeAttributes[i]; ++i) {
     this.attributes[autosizeAttributes[i]] =
         new AutosizeDimensionAttribute(autosizeAttributes[i], this);
   }
 };