Update ash phantom window aesthetics.

ui/wm/core/shadow_controller.h

 // Copyright (c) 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 UI_WM_CORE_SHADOW_CONTROLLER_H_
 #define UI_WM_CORE_SHADOW_CONTROLLER_H_
 
 #include <map>
 
 #include "base/compiler_specific.h"
 #include "base/macros.h"
 #include "base/memory/ref_counted.h"
+#include "ui/wm/core/shadow_types.h"
 #include "ui/wm/public/activation_change_observer.h"
 #include "ui/wm/wm_export.h"
 
 namespace aura {
 class Window;
 namespace client {
 class ActivationClient;
 }
 }
 
 namespace wm {
 
 class Shadow;
 
 // ShadowController observes changes to windows and creates and updates drop
 // shadows as needed. ShadowController itself is light weight and per
 // ActivationClient. ShadowController delegates to its implementation class,
 // which observes all window creation.
 class WM_EXPORT ShadowController :
     public aura::client::ActivationChangeObserver {
  public:
+  static constexpr ShadowElevation kActiveNormalShadowElevation =
+      ShadowElevation::LARGE;
+
   // Returns the shadow for the |window|, or NULL if no shadow exists.
   static Shadow* GetShadowForWindow(aura::Window* window);
 
   explicit ShadowController(aura::client::ActivationClient* activation_client);
   ~ShadowController() override;
 
   // aura::client::ActivationChangeObserver overrides:
   void OnWindowActivated(
       aura::client::ActivationChangeObserver::ActivationReason reason,
       aura::Window* gained_active,
       aura::Window* lost_active) override;
 
  private:
   class Impl;
 
   aura::client::ActivationClient* activation_client_;
 
   scoped_refptr<Impl> impl_;
 
   DISALLOW_COPY_AND_ASSIGN(ShadowController);
 };
 
 }  // namespace wm
 
 #endif  // UI_WM_CORE_SHADOW_CONTROLLER_H_