Use the new animation tween type for app list folder animation.

ui/app_list/views/folder_background_view.cc

 // Copyright 2014 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/app_list/views/folder_background_view.h"
 
 #include "ui/app_list/app_list_constants.h"
 #include "ui/app_list/views/app_list_folder_view.h"
 #include "ui/app_list/views/apps_container_view.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
@@ skipping 37 matching lines @@
   } else {
     layer()->SetOpacity(1.0f);
     layer()->SetTransform(gfx::Transform());
   }
 
   ui::ScopedLayerAnimationSettings settings(layer()->GetAnimator());
   settings.AddObserver(this);
   settings.SetTransitionDuration(
       base::TimeDelta::FromMilliseconds((kBubbleTransitionDurationMs)));
   if (show_state_ == SHOW_BUBBLE) {
+    settings.SetTweenType(gfx::Tween::EASE_OUT_2);
     layer()->SetOpacity(1.0f);
     layer()->SetTransform(gfx::Transform());
   } else {
+    settings.SetTweenType(gfx::Tween::EASE_IN_3);
     layer()->SetOpacity(0.0f);
     layer()->SetTransform(transform);
   }
 
   SchedulePaint();
 }
 
 int FolderBackgroundView::GetFolderContainerBubbleRadius() const {
   return GetContentsBounds().height() / 2;
 }
@@ skipping 14 matching lines @@
 
 void FolderBackgroundView::OnImplicitAnimationsCompleted() {
   // Show folder name after the ink bubble disappears.
   if (show_state_ == HIDE_BUBBLE) {
     static_cast<AppsContainerView*>(parent())->app_list_folder_view()->
         UpdateFolderNameVisibility(true);
   }
 }
 
 }  // namespace app_list