Added ui::test::MultiLayerAnimatorTestController and Delegate.

ui/views/animation/test/square_ink_drop_animation_test_api.cc

 // Copyright 2015 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/square_ink_drop_animation_test_api.h"
 
 #include <vector>
 
 #include "base/time/time.h"
 #include "ui/compositor/layer.h"
@@ skipping 21 matching lines @@
     InkDropTransforms* transforms_out) const {
   ink_drop_animation()->CalculateRectTransforms(size, corner_radius,
                                                 transforms_out);
 }
 
 float SquareInkDropAnimationTestApi::GetCurrentOpacity() const {
   return ink_drop_animation()->GetCurrentOpacity();
 }
 
 std::vector<ui::LayerAnimator*>
-SquareInkDropAnimationTestApi::GetLayerAnimators() const {
+SquareInkDropAnimationTestApi::GetLayerAnimators() {
   std::vector<ui::LayerAnimator*> animators =
       InkDropAnimationTestApi::GetLayerAnimators();
   animators.push_back(ink_drop_animation()->GetRootLayer()->GetAnimator());
   for (int i = 0; i < SquareInkDropAnimation::PAINTED_SHAPE_COUNT; ++i)
     animators.push_back(
         ink_drop_animation()->painted_layers_[i]->GetAnimator());
   return animators;
 }
 
 }  // namespace test
 }  // namespace views