Reland of [ash-md] Fades overview header in and out

ash/common/frame/default_header_painter.h

 // Copyright 2014 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_DEFAULT_HEADER_PAINTER_H_
 #define ASH_COMMON_FRAME_DEFAULT_HEADER_PAINTER_H_
 
 #include <memory>
 
 #include "ash/ash_export.h"
@@ skipping 37 matching lines @@
   int GetHeaderHeightForPainting() const override;
   void SetHeaderHeightForPainting(int height) override;
   void SchedulePaintForTitle() override;
 
   // Sets the left header view for the header. Passing NULL removes the view.
   void UpdateLeftHeaderView(views::View* left_header_view);
 
   // Sets the active and inactive frame colors. Note the inactive frame color
   // will have some transparency added when the frame is drawn.
   void SetFrameColors(SkColor active_frame_color, SkColor inactive_frame_color);
+  SkColor GetActiveFrameColor() const;
+  SkColor GetInactiveFrameColor() const;
 
  private:
   FRIEND_TEST_ALL_PREFIXES(DefaultHeaderPainterTest, TitleIconAlignment);
   FRIEND_TEST_ALL_PREFIXES(DefaultHeaderPainterTest, LightIcons);
 
   // gfx::AnimationDelegate override:
   void AnimationProgressed(const gfx::Animation* animation) override;
 
   // Paints highlight around the edge of the header for inactive restored
   // windows.
@@ skipping 43 matching lines @@
   bool initial_paint_;
 
   std::unique_ptr<gfx::SlideAnimation> activation_animation_;
 
   DISALLOW_COPY_AND_ASSIGN(DefaultHeaderPainter);
 };
 
 }  // namespace ash
 
 #endif  // ASH_COMMON_FRAME_DEFAULT_HEADER_PAINTER_H_