Add always-on-top property to app windows

chrome/browser/ui/views/apps/native_app_window_views.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 CHROME_BROWSER_UI_VIEWS_APPS_NATIVE_APP_WINDOW_VIEWS_H_
 #define CHROME_BROWSER_UI_VIEWS_APPS_NATIVE_APP_WINDOW_VIEWS_H_
 
 #include "apps/native_app_window.h"
 #include "apps/shell_window.h"
 #include "base/observer_list.h"
@@ skipping 129 matching lines @@
   virtual void UpdateWindowTitle() OVERRIDE;
   virtual void UpdateInputRegion(scoped_ptr<SkRegion> region) OVERRIDE;
   virtual void UpdateDraggableRegions(
       const std::vector<extensions::DraggableRegion>& regions) OVERRIDE;
   virtual void HandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) OVERRIDE;
   virtual gfx::Insets GetFrameInsets() const OVERRIDE;
   virtual bool IsVisible() const OVERRIDE;
   virtual void HideWithApp() OVERRIDE;
   virtual void ShowWithApp() OVERRIDE;
+  virtual void SetAlwaysOnTop(bool always_on_top) OVERRIDE;
 
   // web_modal::WebContentsModalDialogHost implementation.
   virtual gfx::NativeView GetHostView() const OVERRIDE;
   virtual gfx::Point GetDialogPosition(const gfx::Size& size) OVERRIDE;
   virtual gfx::Size GetMaximumDialogSize() OVERRIDE;
   virtual void AddObserver(
       web_modal::ModalDialogHostObserver* observer) OVERRIDE;
   virtual void RemoveObserver(
       web_modal::ModalDialogHostObserver* observer) OVERRIDE;
 
@@ skipping 29 matching lines @@
   views::UnhandledKeyboardEventHandler unhandled_keyboard_event_handler_;
 
   base::WeakPtrFactory<NativeAppWindowViews> weak_ptr_factory_;
 
   ObserverList<web_modal::ModalDialogHostObserver> observer_list_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeAppWindowViews);
 };
 
 #endif  // CHROME_BROWSER_UI_VIEWS_APPS_NATIVE_APP_WINDOW_VIEWS_H_