Refactor backdrop that is currently used in the maximized mode.

components/exo/shell_surface.h

 // Copyright 2015 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 COMPONENTS_EXO_SHELL_SURFACE_H_
 #define COMPONENTS_EXO_SHELL_SURFACE_H_
 
 #include <cstdint>
 #include <deque>
 #include <memory>
@@ skipping 31 matching lines @@
 // This class provides functions for treating a surfaces like toplevel,
 // fullscreen or popup widgets, move, resize or maximize them, associate
 // metadata like title and class, etc.
 class ShellSurface : public SurfaceDelegate,
                      public SurfaceObserver,
                      public views::WidgetDelegate,
                      public views::View,
                      public ash::wm::WindowStateObserver,
                      public aura::WindowObserver,
                      public WMHelper::ActivationObserver,
-                     public WMHelper::AccessibilityObserver,
                      public WMHelper::DisplayConfigurationObserver {
  public:
   enum class BoundsMode { SHELL, CLIENT, FIXED };
 
   // The |origin| is in screen coordinates. When bounds are controlled by the
   // shell or fixed, it determines the initial position of the shell surface.
   // In that case, the position specified as part of the geometry is relative
   // to the shell surface.
   //
   // When bounds are controlled by the client, it represents the origin of a
@@ skipping 193 matching lines @@
   void OnWindowBoundsChanged(aura::Window* window,
                              const gfx::Rect& old_bounds,
                              const gfx::Rect& new_bounds) override;
   void OnWindowDestroying(aura::Window* window) override;
 
   // Overridden from WMHelper::ActivationObserver:
   void OnWindowActivated(
       aura::Window* gained_active,
       aura::Window* lost_active) override;
 
-  // Overridden from WMHelper::AccessibilityObserver:
-  void OnAccessibilityModeChanged() override;
-
   // Overridden from WMHelper::DisplayConfigurationObserver:
   void OnDisplayConfigurationChanged() override;
 
   // Overridden from ui::EventHandler:
   void OnKeyEvent(ui::KeyEvent* event) override;
   void OnMouseEvent(ui::MouseEvent* event) override;
 
   // Overridden from ui::AcceleratorTarget:
   bool AcceleratorPressed(const ui::Accelerator& accelerator) override;
 
@@ skipping 81 matching lines @@
   ConfigureCallback configure_callback_;
   ScopedConfigure* scoped_configure_ = nullptr;
   bool ignore_window_bounds_changes_ = false;
   gfx::Vector2d origin_offset_;
   gfx::Vector2d pending_origin_offset_;
   gfx::Vector2d pending_origin_offset_accumulator_;
   int resize_component_ = HTCAPTION;  // HT constant (see ui/base/hit_test.h)
   int pending_resize_component_ = HTCAPTION;
   std::unique_ptr<aura::Window> shadow_overlay_;
   std::unique_ptr<aura::Window> shadow_underlay_;
-  std::unique_ptr<ui::EventHandler> shadow_underlay_event_handler_;
   gfx::Rect shadow_content_bounds_;
   float shadow_background_opacity_ = 1.0;
   std::deque<Config> pending_configs_;
   std::unique_ptr<ash::WindowResizer> resizer_;
   std::unique_ptr<ScopedAnimationsDisabled> scoped_animations_disabled_;
   int top_inset_height_ = 0;
   int pending_top_inset_height_ = 0;
   bool shadow_underlay_in_surface_ = true;
   bool pending_shadow_underlay_in_surface_ = true;
   bool system_modal_ = false;
 
   DISALLOW_COPY_AND_ASSIGN(ShellSurface);
 };
 
 }  // namespace exo
 
 #endif  // COMPONENTS_EXO_SHELL_SURFACE_H_