[ash-md] Fades overview header in and out

ash/common/frame/header_view.h

 // Copyright 2016 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_FRAME_HEADER_VIEW_H_
 #define ASH_COMMON_FRAME_HEADER_VIEW_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 42 matching lines @@
   int GetPreferredHeight() const;
 
   // Returns the view's minimum width.
   int GetMinimumWidth() const;
 
   void UpdateAvatarIcon();
 
   void SizeConstraintsChanged();
 
   void SetFrameColors(SkColor active_frame_color, SkColor inactive_frame_color);
+  SkColor GetActiveFrameColor() const;
+  SkColor GetInactiveFrameColor() const;
 
   // views::View:
   void Layout() override;
   void OnPaint(gfx::Canvas* canvas) override;
   void ChildPreferredSizeChanged(views::View* child) override;
 
   // ShellObserver:
   void OnOverviewModeStarting() override;
   void OnOverviewModeEnded() override;
   void OnMaximizeModeStarted() override;
@@ skipping 30 matching lines @@
 
   // Has this instance been set as the ImmersiveFullscreenControllerDelegate?
   bool is_immersive_delegate_ = true;
 
   DISALLOW_COPY_AND_ASSIGN(HeaderView);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_FRAME_HEADER_VIEW_H_