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

ash/mus/bridge/wm_window_mus.h

Index: ash/mus/bridge/wm_window_mus.h
diff --git a/ash/mus/bridge/wm_window_mus.h b/ash/mus/bridge/wm_window_mus.h
index 92fc8eda6f3cf51dc93722027ee300aa99e57bf5..64bcd9f630fd2ca94eeaba05db06e65f52a31c01 100644
--- a/ash/mus/bridge/wm_window_mus.h
+++ b/ash/mus/bridge/wm_window_mus.h
@@ -135,10 +135,13 @@ class WmWindowMus : public WmWindow, public ui::WindowObserver {
   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;