Enabled tests to control material design ink drop animations.

ui/views/animation/ink_drop_hover.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_hover.h"
 
 #include "third_party/skia/include/core/SkColor.h"
 #include "ui/compositor/callback_layer_animation_observer.h"
 #include "ui/compositor/layer.h"
 #include "ui/compositor/layer_animation_sequence.h"
@@ skipping 41 matching lines @@
 void InkDropHover::FadeIn(const base::TimeDelta& duration) {
   layer_->SetOpacity(kHiddenOpacity);
   layer_->SetVisible(true);
   AnimateFade(FADE_IN, duration, size_, size_);
 }
 
 void InkDropHover::FadeOut(const base::TimeDelta& duration, bool explode) {
   AnimateFade(FADE_OUT, duration, size_, explode ? explode_size_ : size_);
 }
 
+test::InkDropHoverTestApi* InkDropHover::GetTestApi() {
+  return nullptr;
+}
+
 void InkDropHover::AnimateFade(HoverAnimationType animation_type,
                                const base::TimeDelta& duration,
                                const gfx::Size& initial_size,
                                const gfx::Size& target_size) {
   last_animation_initiated_was_fade_in_ = animation_type == FADE_IN;
 
   layer_->SetTransform(CalculateTransform(initial_size));
 
   // The |animation_observer| will be destroyed when the
   // AnimationStartedCallback() returns true.
@@ skipping 43 matching lines @@
     HoverAnimationType animation_type,
     const ui::CallbackLayerAnimationObserver& observer) {
   // AnimationEndedCallback() may be invoked when this is being destroyed and
   // |layer_| may be null.
   if (animation_type == FADE_OUT && layer_)
     layer_->SetVisible(false);
   return true;
 }
 
 }  // namespace views