Add flag to enable immersive fullscreen for v2 apps

ash/wm/immersive_fullscreen_controller_unittest.cc

 // 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.
 
 #include "ash/wm/immersive_fullscreen_controller.h"
 
 #include "ash/display/display_manager.h"
 #include "ash/root_window_controller.h"
 #include "ash/screen_ash.h"
 #include "ash/shelf/shelf_layout_manager.h"
@@ skipping 36 matching lines @@
   virtual void OnImmersiveRevealEnded() OVERRIDE {
     visible_fraction_ = 0;
   }
   virtual void OnImmersiveFullscreenExited() OVERRIDE {
     enabled_ = false;
     visible_fraction_ = 1;
   }
   virtual void SetVisibleFraction(double visible_fraction) OVERRIDE {
     visible_fraction_ = visible_fraction;
   }
-  virtual std::vector<gfx::Rect> GetVisibleBoundsInScreen() OVERRIDE {
+  virtual std::vector<gfx::Rect> GetVisibleBoundsInScreen() const OVERRIDE {
     std::vector<gfx::Rect> bounds_in_screen;
     bounds_in_screen.push_back(top_container_view_->GetBoundsInScreen());
     return bounds_in_screen;
   }
 
   bool is_enabled() const {
     return enabled_;
   }
 
   double visible_fraction() const {
@@ skipping 822 matching lines @@
   // Disabling immersive fullscreen maintains the user's auto-hide selection.
   controller()->SetEnabled(false);
   window()->SetProperty(aura::client::kShowStateKey,
                         ui::SHOW_STATE_NORMAL);
   EXPECT_EQ(ash::SHELF_AUTO_HIDE, shelf->visibility_state());
 }
 
 }  // namespase ash
 
 #endif  // defined(OS_CHROMEOS)