Introduce chrome.shell.createWindow stub API for app_shell

chrome/renderer/chrome_content_renderer_client.cc

Index: chrome/renderer/chrome_content_renderer_client.cc
diff --git a/chrome/renderer/chrome_content_renderer_client.cc b/chrome/renderer/chrome_content_renderer_client.cc
index 7101411854cac8efa6edc0dc8410dacfa847754b..66694c52d07c54e1f3685651940c1c02d63a62c1 100644
--- a/chrome/renderer/chrome_content_renderer_client.cc
+++ b/chrome/renderer/chrome_content_renderer_client.cc
@@ -226,6 +226,11 @@ bool ShouldUseJavaScriptSettingForPlugin(const WebPluginInfo& plugin) {
 
 ChromeContentRendererClient::ChromeContentRendererClient() {
   g_current_client = this;
+
+  extensions::ExtensionsClient::Set(
+      extensions::ChromeExtensionsClient::GetInstance());
+  extensions::ExtensionsRendererClient::Set(
+      ChromeExtensionsRendererClient::GetInstance());
 }
 
 ChromeContentRendererClient::~ChromeContentRendererClient() {
@@ -236,8 +241,9 @@ void ChromeContentRendererClient::RenderThreadStarted() {
   RenderThread* thread = RenderThread::Get();
 
   chrome_observer_.reset(new ChromeRenderProcessObserver(this));
+
   // ChromeRenderViewTest::SetUp() creates its own ExtensionDispatcher and
-  // injects it using SetExtensionDispatcher(). Don't overwrite it.
+  // injects it using SetExtensionDispatcherForTest(). Don't overwrite it.
   if (!extension_dispatcher_)
     extension_dispatcher_.reset(new extensions::Dispatcher());
   permissions_policy_delegate_.reset(
@@ -359,11 +365,6 @@ void ChromeContentRendererClient::RenderThreadStarted() {
   WebSecurityPolicy::registerURLSchemeAsBypassingContentSecurityPolicy(
       extension_resource_scheme);
 
-  extensions::ExtensionsClient::Set(
-      extensions::ChromeExtensionsClient::GetInstance());
-  extensions::ExtensionsRendererClient::Set(
-      ChromeExtensionsRendererClient::GetInstance());
-
 #if defined(OS_WIN)
   // Report if the renderer process has been patched by chrome_elf.
   // TODO(csharp): Remove once the renderer is no longer getting
@@ -1249,7 +1250,7 @@ bool ChromeContentRendererClient::ShouldOverridePageVisibilityState(
   return true;
 }
 
-void ChromeContentRendererClient::SetExtensionDispatcher(
+void ChromeContentRendererClient::SetExtensionDispatcherForTest(
     extensions::Dispatcher* extension_dispatcher) {
   extension_dispatcher_.reset(extension_dispatcher);
   permissions_policy_delegate_.reset(
@@ -1257,6 +1258,11 @@ void ChromeContentRendererClient::SetExtensionDispatcher(
           extension_dispatcher_.get()));
 }
 
+extensions::Dispatcher*
+ChromeContentRendererClient::GetExtensionDispatcherForTest() {
+  return extension_dispatcher_.get();
+}
+
 bool ChromeContentRendererClient::CrossesExtensionExtents(
     WebFrame* frame,
     const GURL& new_url,