Re-open DevTools windows for PackagedApps if they are reloaded with DevTools open.

chrome/browser/extensions/api/app_window/app_window_api.h

 // Copyright (c) 2012 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 CHROME_BROWSER_EXTENSIONS_API_APP_WINDOW_APP_WINDOW_API_H_
 #define CHROME_BROWSER_EXTENSIONS_API_APP_WINDOW_APP_WINDOW_API_H_
 
 #include "chrome/browser/extensions/extension_function.h"
 
 namespace extensions {
 
-class AppWindowCreateFunction : public SyncExtensionFunction {
+class AppWindowCreateFunction : public AsyncExtensionFunction {
  public:
   DECLARE_EXTENSION_FUNCTION_NAME("app.window.create");
+  AppWindowCreateFunction();
 
  protected:
-  virtual ~AppWindowCreateFunction() {}
+  virtual ~AppWindowCreateFunction();
   virtual bool RunImpl() OVERRIDE;
+
+ private:
+  class DelayedResponseForDevTools;
+  scoped_ptr<DelayedResponseForDevTools> delay_response_;
 };
 
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_APP_WINDOW_APP_WINDOW_API_H_