Fullscreen backdrop window for maximize mode

ash/common/wm/maximize_mode/workspace_backdrop_delegate.h

 // Copyright 2014 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_COMMON_WM_MAXIMIZE_MODE_WORKSPACE_BACKDROP_DELEGATE_H_
 #define ASH_COMMON_WM_MAXIMIZE_MODE_WORKSPACE_BACKDROP_DELEGATE_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 17 matching lines @@
   explicit WorkspaceBackdropDelegate(WmWindow* container);
   ~WorkspaceBackdropDelegate() override;
 
   // WorkspaceLayoutManagerBackdropDelegate overrides:
   void OnWindowAddedToLayout(WmWindow* child) override;
   void OnWindowRemovedFromLayout(WmWindow* child) override;
   void OnChildWindowVisibilityChanged(WmWindow* child, bool visible) override;
   void OnWindowStackingChanged(WmWindow* window) override;
   void OnPostWindowStateTypeChange(wm::WindowState* window_state,
                                    wm::WindowStateType old_type) override;
-  void OnDisplayWorkAreaInsetsChanged() override;
 
  private:
-  class WindowObserverImpl;
-
   // Restack the backdrop relatively to the other windows in the container.
   void RestackBackdrop();
 
   // Returns the current visible top level window in the container.
   WmWindow* GetCurrentTopWindow();
 
-  // Position & size the background over the container window.
-  void AdjustToContainerBounds();
-
   // Show the overlay.
   void Show();
 
-  std::unique_ptr<WindowObserverImpl> container_observer_;
-
   // The background which covers the rest of the screen.
   views::Widget* background_ = nullptr;
   // WmWindow for |background_|.
   WmWindow* background_window_ = nullptr;
 
   // The window which is being "maximized".
   WmWindow* container_;
 
   // If true, the |RestackOrHideWindow| might recurse.
   bool in_restacking_;
 
   DISALLOW_COPY_AND_ASSIGN(WorkspaceBackdropDelegate);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_WM_MAXIMIZE_MODE_WORKSPACE_BACKDROP_DELEGATE_H_