Enabled tests to control material design ink drop animations.

ui/views/animation/ink_drop_animation.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/ink_drop_animation.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "ui/base/ui_base_switches.h"
@@ skipping 73 matching lines @@
   target_ink_drop_state_ = InkDropState::ACTIVATED;
   animation_observer->SetActive();
 }
 
 void InkDropAnimation::HideImmediately() {
   AbortAllAnimations();
   SetStateToHidden();
   target_ink_drop_state_ = InkDropState::HIDDEN;
 }
 
+test::InkDropAnimationTestApi* InkDropAnimation::GetTestApi() {
+  return nullptr;
+}
+
 void InkDropAnimation::AnimationStartedCallback(
     InkDropState ink_drop_state,
     const ui::CallbackLayerAnimationObserver& observer) {
   observer_->AnimationStarted(ink_drop_state);
 }
 
 bool InkDropAnimation::AnimationEndedCallback(
     InkDropState ink_drop_state,
     const ui::CallbackLayerAnimationObserver& observer) {
   if (ink_drop_state == InkDropState::HIDDEN)
     SetStateToHidden();
   observer_->AnimationEnded(ink_drop_state,
                             observer.aborted_count()
                                 ? InkDropAnimationEndedReason::PRE_EMPTED
                                 : InkDropAnimationEndedReason::SUCCESS);
   // |this| may be deleted!
   return true;
 }
 
 }  // namespace views