[ash-md] Fades overview header in and out

ash/aura/wm_window_aura.h

Index: ash/aura/wm_window_aura.h
diff --git a/ash/aura/wm_window_aura.h b/ash/aura/wm_window_aura.h
index 360ab9340a2409fe8fcb113676b32ce8abdc7bda..03aa0396e78c48e6d3633ad8eef054d0b1fac73c 100644
--- a/ash/aura/wm_window_aura.h
+++ b/ash/aura/wm_window_aura.h
@@ -73,10 +73,13 @@ class ASH_EXPORT WmWindowAura : public WmWindow,
   bool IsVisible() const override;
   void SetOpacity(float opacity) override;
   float GetTargetOpacity() const override;
+  gfx::Rect GetMinimizeAnimationTargetBoundsInScreen() const override;
   void SetTransform(const gfx::Transform& transform) override;
   gfx::Transform GetTargetTransform() const override;
   bool IsSystemModal() const override;
   bool GetBoolProperty(WmWindowProperty key) override;
+  SkColor GetColorProperty(WmWindowProperty key) override;
+  void SetColorProperty(WmWindowProperty key, SkColor value) override;
   int GetIntProperty(WmWindowProperty key) override;
   void SetIntProperty(WmWindowProperty key, int value) override;
   ShelfItemDetails* GetShelfItemDetails() override;