Enable webview tag in webui

extensions/browser/guest_view/app_view/app_view_guest.cc

 // 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.
 
 #include "extensions/browser/guest_view/app_view/app_view_guest.h"
 
 #include "base/command_line.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/common/renderer_preferences.h"
 #include "extensions/browser/api/app_runtime/app_runtime_api.h"
@@ skipping 125 matching lines @@
   return appview::kEmbedderAPINamespace;
 }
 
 int AppViewGuest::GetTaskPrefix() const {
   return IDS_EXTENSION_TASK_MANAGER_APPVIEW_TAG_PREFIX;
 }
 
 void AppViewGuest::CreateWebContents(
     const std::string& embedder_extension_id,
     int embedder_render_process_id,
+    const GURL& embedder_site_url,
     const base::DictionaryValue& create_params,
     const WebContentsCreatedCallback& callback) {
   std::string app_id;
   if (!create_params.GetString(appview::kAppID, &app_id)) {
     callback.Run(NULL);
     return;
   }
 
   const base::DictionaryValue* data = NULL;
   if (!create_params.GetDictionary(appview::kData, &data)) {
@@ skipping 94 matching lines @@
 
   scoped_ptr<base::DictionaryValue> embed_request(new base::DictionaryValue());
   embed_request->SetInteger(appview::kGuestInstanceID, guest_instance_id());
   embed_request->SetString(appview::kEmbedderID, embedder_extension_id());
   embed_request->Set(appview::kData, data.release());
   AppRuntimeEventRouter::DispatchOnEmbedRequestedEvent(
       browser_context(), embed_request.Pass(), extension_host->extension());
 }
 
 }  // namespace extensions