Enable shelf gestures in immersive mode

ash/shelf/shelf_layout_manager.h

 // Copyright (c) 2012 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_SHELF_SHELF_LAYOUT_MANAGER_H_
 #define ASH_SHELF_SHELF_LAYOUT_MANAGER_H_
 
 #include "ash/ash_export.h"
 #include "ash/launcher/launcher.h"
 #include "ash/shelf/background_animator.h"
@@ skipping 166 matching lines @@
   }
 
   template<typename T>
   T PrimaryAxisValue(T horizontal, T vertical) const {
     return IsHorizontalAlignment() ? horizontal : vertical;
   }
 
   // Is the shelf's alignment horizontal?
   bool IsHorizontalAlignment() const;
 
+  // Tests if the browser is currently in fullscreen mode with minimal
+  // Chrome. When minimal Chrome is present the shelf should be displayed.
+  bool FullscreenWithMinimalChrome() const;
+
   // Returns a ShelfLayoutManager on the display which has a launcher for
   // given |window|. See RootWindowController::ForLauncher for more info.
   static ShelfLayoutManager* ForLauncher(aura::Window* window);
 
  private:
   class AutoHideEventFilter;
   class UpdateShelfObserver;
   friend class ash::ScreenAsh;
   friend class PanelLayoutManagerTest;
   friend class ShelfLayoutManagerTest;
@@ skipping 139 matching lines @@
   // The bounds of the keyboard.
   gfx::Rect keyboard_bounds_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace internal
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_H_