Make <webview> use out-of-process iframe architecture.

extensions/renderer/resources/guest_view/guest_view_container.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 shared functionality for different guestview
 // containers, such as web_view, app_view, etc.
 
 var DocumentNatives = requireNative('document_natives');
 var GuestView = require('guestView').GuestView;
 var GuestViewInternalNatives = requireNative('guest_view_internal');
@@ skipping 46 matching lines @@
 
 GuestViewContainer.prototype.createBrowserPluginElement = function() {
   // We create BrowserPlugin as a custom element in order to observe changes
   // to attributes synchronously.
   var browserPluginElement =
       new GuestViewContainer[this.viewType + 'BrowserPlugin']();
   privates(browserPluginElement).internal = this;
   return browserPluginElement;
 };
 
+GuestViewContainer.prototype.getBrowserPluginElement = function() {
+  return privates(this).browserPluginElement;
+};
+
 GuestViewContainer.prototype.setupFocusPropagation = function() {
   if (!this.element.hasAttribute('tabIndex')) {
     // GuestViewContainer needs a tabIndex in order to be focusable.
     // TODO(fsamuel): It would be nice to avoid exposing a tabIndex attribute
     // to allow GuestViewContainer to be focusable.
     // See http://crbug.com/231664.
     this.element.setAttribute('tabIndex', -1);
   }
   this.element.addEventListener('focus', function(e) {
     // Focus the BrowserPlugin when the GuestViewContainer takes focus.
@@ skipping 50 matching lines @@
 GuestViewContainer.prototype.onElementAttached = function() {};
 GuestViewContainer.prototype.onElementDetached = function() {
   this.guest.destroy();
 };
 GuestViewContainer.prototype.onElementResize = function(oldWidth, oldHeight,
                                                         newWidth, newHeight) {};
 
 // Registers the browser plugin <object> custom element. |viewType| is the
 // name of the specific guestview container (e.g. 'webview').
 function registerBrowserPluginElement(viewType) {
-  var proto = Object.create(HTMLObjectElement.prototype);
+  //var proto = Object.create(HTMLObjectElement.prototype);
+  var proto = Object.create(HTMLIFrameElement.prototype);
 
   proto.createdCallback = function() {
-    this.setAttribute('type', 'application/browser-plugin');
-    this.setAttribute('id', 'browser-plugin-' + IdGenerator.GetNextId());
+    //this.setAttribute('type', 'application/browser-plugin');
+    //this.setAttribute('id', 'browser-plugin-' + IdGenerator.GetNextId());
     this.style.width = '100%';
     this.style.height = '100%';
   };
 
   proto.attachedCallback = function() {
     // Load the plugin immediately.
     var unused = this.nonExistentAttribute;
   };
 
+  /*
   proto.attributeChangedCallback = function(name, oldValue, newValue) {
     var internal = privates(this).internal;
     if (!internal) {
       return;
     }
     internal.handleBrowserPluginAttributeMutation(name, oldValue, newValue);
   };
+  */
 
   GuestViewContainer[viewType + 'BrowserPlugin'] =
       DocumentNatives.RegisterElement(viewType + 'browserplugin',
-                                      {extends: 'object', prototype: proto});
+                                      //{extends: 'object', prototype: proto});
+                                      {extends: 'iframe', prototype: proto});
 
   delete proto.createdCallback;
   delete proto.attachedCallback;
   delete proto.detachedCallback;
   delete proto.attributeChangedCallback;
 };
 
 // Registers the guestview container as a custom element.
 // |guestViewContainerType| is the type of guestview container
 // (e.g.WebViewImpl).
@@ skipping 45 matching lines @@
   // Delete the callbacks so developers cannot call them and produce unexpected
   // behavior.
   delete proto.createdCallback;
   delete proto.attachedCallback;
   delete proto.detachedCallback;
   delete proto.attributeChangedCallback;
 }
 
 // Exports.
 exports.GuestViewContainer = GuestViewContainer;