[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 2f4c8d96feeec3bd3433637386f1e880f318e6d1..fe5aaa75bc27252c66793b33967267a64f74f545 100644
--- a/ash/mus/bridge/wm_window_mus.h
+++ b/ash/mus/bridge/wm_window_mus.h
@@ -129,10 +129,13 @@ 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;