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

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

Index: chrome/browser/extensions/api/app_window/app_window_api.h
diff --git a/chrome/browser/extensions/api/app_window/app_window_api.h b/chrome/browser/extensions/api/app_window/app_window_api.h
index 70b0e4ac80dcbdb807af390936160a66e1826260..cb37e1540a4b194da62e688150764bccd6102753 100644
--- a/chrome/browser/extensions/api/app_window/app_window_api.h
+++ b/chrome/browser/extensions/api/app_window/app_window_api.h
@@ -9,13 +9,18 @@
 
 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