Tweaks to "Allow InkDropRipple to co-exist with highlight or not exist at all."

ui/views/animation/empty_ink_drop_ripple.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/empty_ink_drop_ripple.h"
+
+namespace views {
+
+EmptyInkDropRipple::EmptyInkDropRipple() {}
+
+EmptyInkDropRipple::~EmptyInkDropRipple() {}
+
+ui::Layer* EmptyInkDropRipple::GetRootLayer() {
+  return nullptr;
+}
+
+bool EmptyInkDropRipple::OverridesHighlight() const {
+  return false;
+}
+
+void EmptyInkDropRipple::AnimateStateChange(
+    InkDropState old_ink_drop_state,
+    InkDropState new_ink_drop_state,
+    ui::LayerAnimationObserver* observer) {}
+
+void EmptyInkDropRipple::SetStateToHidden() {}
+
+void EmptyInkDropRipple::AbortAllAnimations() {}
+
+}  // namespace views