Use MD-ash's auto hide behavior for arc++ windows.

ash/shelf/shelf_layout_manager.h

 // Copyright 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 <memory>
 
 #include "ash/ash_export.h"
 #include "ash/common/session/session_state_observer.h"
 #include "ash/common/shelf/shelf_types.h"
 #include "ash/common/shell_observer.h"
 #include "ash/common/wm/background_animator.h"
 #include "ash/common/wm/dock/docked_window_layout_manager_observer.h"
 #include "ash/common/wm/lock_state_observer.h"
+#include "ash/common/wm/window_state.h"
 #include "ash/common/wm/wm_snap_to_pixel_layout_manager.h"
 #include "ash/common/wm/workspace/workspace_types.h"
 #include "ash/common/wm_activation_observer.h"
 #include "ash/shelf/shelf_widget.h"
 #include "base/macros.h"
 #include "base/observer_list.h"
 #include "base/timer/timer.h"
 #include "ui/gfx/geometry/insets.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/keyboard/keyboard_controller_observer.h"
@@ skipping 257 matching lines @@
 
   // Called when the LoginUI changes from visible to invisible.
   void UpdateShelfVisibilityAfterLoginUIChange();
 
   // Compute |target_bounds| opacity based on gesture and shelf visibility.
   float ComputeTargetOpacity(const State& state);
 
   // Returns true if there is a fullscreen window open that causes the shelf
   // to be hidden.
   bool IsShelfHiddenForFullscreen() const;
+  ash::wm::WindowState::FullscreenShelfMode GetShelfModeForFullscreen() const;
 
   // Gesture related functions:
   void StartGestureDrag(const ui::GestureEvent& gesture);
   void UpdateGestureDrag(const ui::GestureEvent& gesture);
   void CompleteGestureDrag(const ui::GestureEvent& gesture);
   void CancelGestureDrag();
 
+  int GetShelfInsetsForAutoHide() const;
+
   // True when inside UpdateBoundsAndOpacity() method. Used to prevent calling
   // UpdateBoundsAndOpacity() again from SetChildBounds().
   bool updating_bounds_;
 
   bool in_shutdown_ = false;
 
   // True if the last mouse event was a mouse drag.
   bool in_mouse_drag_ = false;
 
   // Current state.
@@ skipping 44 matching lines @@
   // keyboard.
   gfx::Rect user_work_area_bounds_;
 
   // The height of the ChromeVox panel at the top of the screen, which
   // needs to be removed from the available work area.
   int chromevox_panel_height_;
 
   // The show hide animation duration override or 0 for default.
   int duration_override_in_ms_;
 
+  // The flag to enforce invisible shelf (as in MD-experiemntal).
+  // TODO(oshima): Remove this when MD immersive is launched.
+  bool invisible_auto_hide_shelf_ = false;
+
   std::unique_ptr<RootWindowControllerObserverImpl>
       root_window_controller_observer_;
 
   DISALLOW_COPY_AND_ASSIGN(ShelfLayoutManager);
 };
 
 }  // namespace ash
 
 #endif  // ASH_SHELF_SHELF_LAYOUT_MANAGER_H_