Flip --enable-apps-show-on-first-paint flag.

apps/app_window_contents.h

 // Copyright 2013 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.
 
 #ifndef APPS_APP_WINDOW_CONTENTS_H_
 #define APPS_APP_WINDOW_CONTENTS_H_
 
 #include <vector>
 
 #include "apps/app_window.h"
@@ skipping 26 matching lines @@
  public:
   explicit AppWindowContentsImpl(AppWindow* host);
   virtual ~AppWindowContentsImpl();
 
   // AppWindowContents
   virtual void Initialize(content::BrowserContext* context,
                           const GURL& url) OVERRIDE;
   virtual void LoadContents(int32 creator_process_id) OVERRIDE;
   virtual void NativeWindowChanged(NativeAppWindow* native_app_window) OVERRIDE;
   virtual void NativeWindowClosed() OVERRIDE;
+  virtual void NativeWindowFirstShown() const OVERRIDE;
   virtual content::WebContents* GetWebContents() const OVERRIDE;
 
  private:
   // content::NotificationObserver
   virtual void Observe(int type,
                        const content::NotificationSource& source,
                        const content::NotificationDetails& details) OVERRIDE;
 
   // content::WebContentsObserver
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
@@ skipping 14 matching lines @@
   scoped_ptr<content::WebContents> web_contents_;
   scoped_ptr<extensions::ExtensionFunctionDispatcher>
       extension_function_dispatcher_;
 
   DISALLOW_COPY_AND_ASSIGN(AppWindowContentsImpl);
 };
 
 }  // namespace apps
 
 #endif  // APPS_APP_WINDOW_CONTENTS_H_