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

extensions/renderer/resources/guest_view/guest_view_iframe.js

 // Copyright 2015 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.
 
 // --site-per-process overrides for guest_view.js.
 
 var GuestView = require('guestView').GuestView;
 var GuestViewImpl = require('guestView').GuestViewImpl;
 var GuestViewInternalNatives = requireNative('guest_view_internal');
 var ResizeEvent = require('guestView').ResizeEvent;
@@ skipping 31 matching lines @@
     } else {
       // Only update the contentWindow if attaching is successful.
       this.contentWindow = contentWindow;
     }
 
     this.handleCallback(callback);
   };
 
   attachParams['instanceId'] = viewInstanceId;
   var contentWindow = getIframeContentWindow(viewInstanceId);
-  // TODO(lazyboy): Call binding function to attach this guest.
-  // |contentWindow| should be used to retrieve the RenderFrame in cpp.
+  // |contentWindow| is used to retrieve the RenderFrame in cpp.
+  GuestViewInternalNatives.AttachIframeGuest(
+      internalInstanceId, this.id, attachParams, contentWindow,
+      callbackWrapper.bind(this, callback));
 
   this.internalInstanceId = internalInstanceId;
   this.state = GuestViewImpl.GuestState.GUEST_STATE_ATTACHED;
 
   // Detach automatically when the container is destroyed.
   GuestViewInternalNatives.RegisterDestructionCallback(
       internalInstanceId, this.weakWrapper(function() {
     if (this.state != GuestViewImpl.GuestState.GUEST_STATE_ATTACHED ||
         this.internalInstanceId != internalInstanceId) {
       return;
@@ skipping 25 matching lines @@
     }
 
     ResizeEvent.addListener(this.callOnResize, {instanceId: this.id});
     this.handleCallback(callback);
   };
 
   this.sendCreateRequest(createParams, callbackWrapper.bind(this, callback));
 
   this.state = GuestViewImpl.GuestState.GUEST_STATE_CREATED;
 };