Make the material design ripple effect more visible on a quick action (single click or single tap)

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 49 matching lines @@
                                const base::TimeDelta& duration) {
   // The |animation_observer| will be destroyed when the
   // AnimationStartedCallback() returns true.
   ui::CallbackLayerAnimationObserver* animation_observer =
       new ui::CallbackLayerAnimationObserver(
           base::Bind(&InkDropHover::AnimationEndedCallback,
                      base::Unretained(this), animation_type));
 
   ui::LayerAnimator* animator = layer_->GetAnimator();
   ui::ScopedLayerAnimationSettings animation(animator);
+  animation.SetTweenType(gfx::Tween::EASE_IN_OUT);
   animation.SetPreemptionStrategy(
       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
   ui::LayerAnimationElement* animation_element =
       ui::LayerAnimationElement::CreateOpacityElement(
           animation_type == FADE_IN ? kHoverVisibleOpacity : kHiddenOpacity,
           duration);
   ui::LayerAnimationSequence* animation_sequence =
       new ui::LayerAnimationSequence(animation_element);
   animation_sequence->AddObserver(animation_observer);
 
@@ skipping 13 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