Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/common/wm/background_animator.h

Index: ash/common/wm/background_animator.h
diff --git a/ash/common/wm/background_animator.h b/ash/common/wm/background_animator.h
index 83a1f8c43df55a49f6156ce22c011566cc14c5e9..341ee23747ce97981c8d44e9d502cd2f63489b6e 100644
--- a/ash/common/wm/background_animator.h
+++ b/ash/common/wm/background_animator.h
@@ -18,10 +18,14 @@ enum BackgroundAnimatorChangeType {
   BACKGROUND_CHANGE_IMMEDIATE
 };
 
+class BackgroundAnimator;
+
 // Delegate is notified any time the background changes.
 class ASH_EXPORT BackgroundAnimatorDelegate {
  public:
-  virtual void UpdateBackground(int alpha) = 0;
+  virtual void UpdateBackground(BackgroundAnimator* animator, int alpha) = 0;
+
+  virtual void BackgroundAnimationEnded(bool successfully) {}

[James Cook, 2016/06/09 23:40:37]

nit: It feels a little weird that the other function is pure-virtual and this
one isn't.

[bruthig, 2016/06/14 16:40:44]

Done. Agreed, this was a short cut to get it up for design review.

 
  protected:
   virtual ~BackgroundAnimatorDelegate() {}