Revert of Replaced BackgroundAnimator with ShelfBackgroundAnimator.

ash/test/material_design_controller_test_api.h

+// 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.
+
+#ifndef ASH_TEST_MATERIAL_DESIGN_CONTROLLER_TEST_API_H_
+#define ASH_TEST_MATERIAL_DESIGN_CONTROLLER_TEST_API_H_
+
+#include "ash/common/material_design/material_design_controller.h"
+#include "base/macros.h"
+
+namespace ash {
+namespace test {
+
+// Test API to access the internal state of the MaterialDesignController class.
+// Creating an instance of this class and then destroying it preserves global
+// state in MaterialDesignController class.
+class MaterialDesignControllerTestAPI {
+ public:
+  explicit MaterialDesignControllerTestAPI(MaterialDesignController::Mode mode);
+  ~MaterialDesignControllerTestAPI();
+
+  // Wrapper functions for MaterialDesignController internal functions.
+  static bool IsMaterial();
+  static bool IsMaterialNormal();
+  static bool IsMaterialExperimental();
+  static MaterialDesignController::Mode DefaultMode();
+  static void Uninitialize();
+
+ private:
+  const MaterialDesignController::Mode previous_mode_;
+
+  DISALLOW_COPY_AND_ASSIGN(MaterialDesignControllerTestAPI);
+};
+
+}  // namespace test
+}  // namespace ash
+
+#endif  // ASH_TEST_MATERIAL_DESIGN_CONTROLLER_TEST_API_H_