Introduce chrome.shell.createWindow stub API for app_shell

chrome/renderer/extensions/chrome_extensions_renderer_client.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 "chrome/renderer/extensions/chrome_extensions_renderer_client.h"
 
 #include "base/lazy_instance.h"
 #include "chrome/renderer/chrome_render_process_observer.h"
 #include "chrome/renderer/isolated_world_ids.h"
 
 ChromeExtensionsRendererClient::ChromeExtensionsRendererClient() {}
 
 ChromeExtensionsRendererClient::~ChromeExtensionsRendererClient() {}
 
 // static
 ChromeExtensionsRendererClient* ChromeExtensionsRendererClient::GetInstance() {
   static base::LazyInstance<ChromeExtensionsRendererClient> client =
       LAZY_INSTANCE_INITIALIZER;
   return client.Pointer();
 }
 
 bool ChromeExtensionsRendererClient::IsIncognitoProcess() const {
   return ChromeRenderProcessObserver::is_incognito_process();
 }
 
 int ChromeExtensionsRendererClient::GetLowestIsolatedWorldId() const {
   return chrome::ISOLATED_WORLD_ID_EXTENSIONS;
 }
+
+void ChromeExtensionsRendererClient::RegisterNativeHandlers(
+    extensions::ModuleSystem* module_system,
+    extensions::ScriptContext* context) {
+}
+
+void ChromeExtensionsRendererClient::PopulateSourceMap(
+    ResourceBundleSourceMap* source_map) {
+}