Added ui::test::MultiLayerAnimatorTestController and Delegate.

ui/views/animation/test/flood_fill_ink_drop_animation_test_api.cc

 // 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 "ui/views/animation/test/flood_fill_ink_drop_animation_test_api.h"
 
 #include <vector>
 
 #include "base/time/time.h"
 #include "ui/compositor/layer.h"
@@ skipping 13 matching lines @@
 gfx::Transform FloodFillInkDropAnimationTestApi::CalculateTransform(
     float target_radius) const {
   return ink_drop_animation()->CalculateTransform(target_radius);
 }
 
 float FloodFillInkDropAnimationTestApi::GetCurrentOpacity() const {
   return ink_drop_animation()->root_layer_.opacity();
 }
 
 std::vector<ui::LayerAnimator*>
-FloodFillInkDropAnimationTestApi::GetLayerAnimators() const {
+FloodFillInkDropAnimationTestApi::GetLayerAnimators() {
   std::vector<ui::LayerAnimator*> animators =
       InkDropAnimationTestApi::GetLayerAnimators();
   animators.push_back(ink_drop_animation()->GetRootLayer()->GetAnimator());
   animators.push_back(ink_drop_animation()->painted_layer_.GetAnimator());
   return animators;
 }
 
 }  // namespace test
 }  // namespace views