Implement autosizing for <extensionoptions>

chrome/renderer/resources/extensions/extension_options_events.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.
 
 var EventBindings = require('event_bindings');
 
 var CreateEvent = function(name) {
   var eventOpts = {supportsListeners: true, supportsFilters: true};
   return new EventBindings.Event(name, undefined, eventOpts);
 };
 
 var EXTENSION_OPTIONS_EVENTS = {
   'load': {
     evt: CreateEvent('extensionOptionsInternal.onLoad'),
     fields: []
   },
+  'sizechanged': {
+    evt: CreateEvent('extensionOptionsInternal.onSizeChanged'),
+    customHandler: function(handler, event, webViewEvent) {
+      handler.handleSizeChangedEvent(event, webViewEvent);
+    },
+    fields:['width', 'height']
+  }
 }
 
 /**
  * @constructor
  */
 function ExtensionOptionsEvents(extensionOptionsInternal, viewInstanceId) {
   this.extensionOptionsInternal = extensionOptionsInternal;
   this.viewInstanceId = viewInstanceId;
   this.setup();
 }
@@ skipping 20 matching lines @@
     if (info.customHandler) {
       info.customHandler(self, e, extensionOptionsEvent);
       return;
     }
     self.extensionOptionsInternal.dispatchEvent(extensionOptionsEvent);
   }, {instanceId: self.viewInstanceId});
 
   this.extensionOptionsInternal.setupEventProperty(name);
 };
 
+ExtensionOptionsEvents.prototype.handleSizeChangedEvent = function(
+    event, extensionOptionsEvent) {
+  this.extensionOptionsInternal.onSizeChanged(extensionOptionsEvent.width,
+                                              extensionOptionsEvent.height);
+  this.extensionOptionsInternal.dispatchEvent(extensionOptionsEvent);
+}
+
 exports.ExtensionOptionsEvents = ExtensionOptionsEvents;
 exports.CreateEvent = CreateEvent;