Add flag to enable immersive fullscreen for v2 apps

chrome/browser/ui/gtk/apps/native_app_window_gtk.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_GTK_APPS_NATIVE_APP_WINDOW_GTK_H_
 #define CHROME_BROWSER_UI_GTK_APPS_NATIVE_APP_WINDOW_GTK_H_
 
 #include <gtk/gtk.h>
 
 #include "apps/shell_window.h"
@@ skipping 49 matching lines @@
   // ActiveWindowWatcherXObserver implementation.
   virtual void ActiveWindowChanged(GdkWindow* active_window) OVERRIDE;
 
   // WebContentsObserver implementation.
   virtual void RenderViewHostChanged(
       content::RenderViewHost* old_host,
       content::RenderViewHost* new_host) OVERRIDE;
 
  private:
   // NativeAppWindow implementation.
-  virtual void SetFullscreen(bool fullscreen) OVERRIDE;
-  virtual bool IsFullscreenOrPending() const OVERRIDE;
+  virtual void SetFullscreen(apps::ShellWindow::FullscreenType type) OVERRIDE;
+  virtual bool SupportsImmersiveFullscreen() const OVERRIDE;
   virtual bool IsDetached() const OVERRIDE;
   virtual void UpdateWindowIcon() OVERRIDE;
   virtual void UpdateWindowTitle() OVERRIDE;
   virtual void UpdateDraggableRegions(
       const std::vector<extensions::DraggableRegion>& regions) OVERRIDE;
   virtual SkRegion* GetDraggableRegion() OVERRIDE;
   virtual void UpdateInputRegion(scoped_ptr<SkRegion> region) OVERRIDE;
   virtual void HandleKeyboardEvent(
       const content::NativeWebKeyboardEvent& event) OVERRIDE;
   virtual bool IsFrameless() const OVERRIDE;
@@ skipping 101 matching lines @@
 
   ui::X11AtomCache atom_cache_;
 
   // True if we listen for the XEvent.
   bool is_x_event_listened_;
 
   DISALLOW_COPY_AND_ASSIGN(NativeAppWindowGtk);
 };
 
 #endif  // CHROME_BROWSER_UI_GTK_APPS_NATIVE_APP_WINDOW_GTK_H_