chromeos: removes mash shadows

ash/mus/shadow.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 ASH_MUS_SHADOW_H_
-#define ASH_MUS_SHADOW_H_
-
-#include <memory>
-
-#include "base/macros.h"
-#include "ui/aura/window_observer.h"
-#include "ui/compositor/layer_animation_observer.h"
-#include "ui/gfx/geometry/rect.h"
-
-namespace ui {
-class Layer;
-}  // namespace ui
-
-namespace ash {
-namespace mus {
-
-// Simple class that draws a drop shadow around content at given bounds.
-// http://crbug.com/670840.
-class Shadow : public ui::ImplicitAnimationObserver,
-               public aura::WindowObserver {
- public:
-  enum Style {
-    // Active windows have more opaque shadows, shifted down to make the window
-    // appear "higher".
-    STYLE_ACTIVE,
-
-    // Inactive windows have less opaque shadows.
-    STYLE_INACTIVE,
-
-    // Small windows like tooltips and context menus have lighter, smaller
-    // shadows.
-    STYLE_SMALL,
-  };
-
-  Shadow();
-  ~Shadow() override;
-
-  void Init(Style style);
-
-  static Shadow* Get(aura::Window* window);
-
-  // Returns the interio inset for the specified style. The interior inset
-  // is the amount of padding added to each side of the content bounds that the
-  // shadow renders into. In other words the shadow extends from all sides of
-  // the layer by this value.
-  static int GetInteriorInsetForStyle(Style style);
-
-  // Returns |layer_.get()|. This is exposed so it can be added to the same
-  // layer as the content and stacked below it.  SetContentBounds() should be
-  // used to adjust the shadow's size and position (rather than applying
-  // transformations to this layer).
-  ui::Layer* layer() const { return layer_.get(); }
-
-  const gfx::Rect& content_bounds() const { return content_bounds_; }
-  Style style() const { return style_; }
-
-  // Moves and resizes the shadow layer to frame |content_bounds|.
-  void SetContentBounds(const gfx::Rect& content_bounds);
-
-  // Sets the shadow's style, animating opacity as necessary.
-  void SetStyle(Style style);
-
-  // Installs this shadow for |window|.
-  void Install(aura::Window* window);
-
-  // ui::ImplicitAnimationObserver overrides:
-  void OnImplicitAnimationsCompleted() override;
-
- private:
-  // Updates the shadow images to the current |style_|.
-  void UpdateImagesForStyle();
-
-  // Updates the shadow layer bounds based on the inteior inset and the current
-  // |content_bounds_|.
-  void UpdateLayerBounds();
-
-  // WindowObserver:
-  void OnWindowDestroyed(aura::Window* window) override;
-
-  // The current style, set when the transition animation starts.
-  Style style_;
-
-  // The parent layer of the shadow layer. It serves as a container accessible
-  // from the outside to control the visibility of the shadow.
-  std::unique_ptr<ui::Layer> layer_;
-
-  // The actual shadow layer corresponding to a cc::NinePatchLayer.
-  std::unique_ptr<ui::Layer> shadow_layer_;
-
-  // Size of the current shadow image.
-  gfx::Size image_size_;
-
-  // Bounds of the content that the shadow encloses.
-  gfx::Rect content_bounds_;
-
-  // The interior inset of the shadow images. The content bounds of the image
-  // grid should be set to |content_bounds_| inset by this amount.
-  int interior_inset_;
-
-  aura::Window* window_;
-
-  DISALLOW_COPY_AND_ASSIGN(Shadow);
-};
-
-}  // namespace mus
-}  // namespace ash
-
-#endif  // ASH_MUS_SHADOW_H_