Add flag to enable immersive fullscreen for v2 apps

ash/wm/immersive_fullscreen_controller.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 ASH_WM_IMMERSIVE_FULLSCREEN_CONTROLLER_H_
 #define ASH_WM_IMMERSIVE_FULLSCREEN_CONTROLLER_H_
 
 #include <vector>
 
 #include "ash/ash_export.h"
@@ skipping 48 matching lines @@
     virtual void OnImmersiveFullscreenExited() = 0;
 
     // Called to update the fraction of the top-of-window views height which is
     // visible.
     virtual void SetVisibleFraction(double visible_fraction) = 0;
 
     // Returns a list of rects whose union makes up the top-of-window views.
     // The returned list is used for hittesting when the top-of-window views
     // are revealed. GetVisibleBoundsInScreen() must return a valid value when
     // not in immersive fullscreen for the sake of SetupForTest().
-    virtual std::vector<gfx::Rect> GetVisibleBoundsInScreen() = 0;
+    virtual std::vector<gfx::Rect> GetVisibleBoundsInScreen() const = 0;
 
    protected:
     virtual ~Delegate() {}
   };
 
   ImmersiveFullscreenController();
   virtual ~ImmersiveFullscreenController();
 
   // Initializes the controller. Must be called prior to enabling immersive
   // fullscreen via SetEnabled(). |top_container| is used to keep the
@@ skipping 206 matching lines @@
   scoped_ptr<BubbleManager> bubble_manager_;
 
   base::WeakPtrFactory<ImmersiveFullscreenController> weak_ptr_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(ImmersiveFullscreenController);
 };
 
 }  // namespace ash
 
 #endif  // ASH_WM_IMMERSIVE_FULLSCREEN_CONTROLLER_H_