Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/shelf/shelf_background_animator_delegate.h

Index: ash/shelf/shelf_background_animator_delegate.h
diff --git a/ash/shelf/shelf_background_animator_delegate.h b/ash/shelf/shelf_background_animator_delegate.h
new file mode 100644
index 0000000000000000000000000000000000000000..930b5ec0227c9c9e5b4b68dbc33fc4a0d6ab9845
--- /dev/null
+++ b/ash/shelf/shelf_background_animator_delegate.h
@@ -0,0 +1,21 @@
+// Copyright 2016 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.
+
+#include "ash/ash_export.h"
+
+namespace ash {
+
+class ASH_EXPORT ShelfBackgroundAnimatorDelegate {
+ public:
+  virtual void UpdateBackgroundAlpha(int alpha) = 0;
+
+ protected:
+  ShelfBackgroundAnimatorDelegate() {}
+  ~ShelfBackgroundAnimatorDelegate() {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(ShelfBackgroundAnimatorDelegate);

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

Do you need this, given that there's a pure-virtual method?

+};
+
+}  // namespace ash