Converts ash to use aura-mus

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 "services/ui/public/cpp/window_observer.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.
-class Shadow : public ui::ImplicitAnimationObserver, public ui::WindowObserver {
+// http://crbug.com/670840.

[James Cook, 2016/12/05 19:21:45]

nit: What is the bug saying to do? Eliminate this class? Investigate something?

[sky, 2016/12/05 21:39:20]

Yes. This class is mostly a copy of the class in ui/wm/core. Now that ash is
using aura it may be possible to get rid of this class entirely.

+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(ui::Window* 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(ui::Window* window) override;
+  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_;
 
-  ui::Window* window_;
+  aura::Window* window_;
 
   DISALLOW_COPY_AND_ASSIGN(Shadow);
 };
 
 }  // namespace mus
 }  // namespace ash
 
 #endif  // ASH_MUS_SHADOW_H_