Fix folder icon animation in app list.

ui/app_list/views/top_icon_animation_view.cc

Index: ui/app_list/views/top_icon_animation_view.cc
diff --git a/ui/app_list/views/top_icon_animation_view.cc b/ui/app_list/views/top_icon_animation_view.cc
index 1d6e2c50253ed6e8eba17695e1183b24cc1730bb..b356c9fa9c09f39f13d00f02b668ce91be31a86b 100644
--- a/ui/app_list/views/top_icon_animation_view.cc
+++ b/ui/app_list/views/top_icon_animation_view.cc
@@ -8,6 +8,7 @@
 #include "ui/app_list/app_list_constants.h"
 #include "ui/compositor/scoped_layer_animation_settings.h"
 #include "ui/gfx/image/image_skia_operations.h"
+#include "ui/gfx/transform_util.h"
 #include "ui/views/controls/image_view.h"
 
 namespace app_list {
@@ -50,11 +51,7 @@ void TopIconAnimationView::TransformView() {
 
   // Transform used for scaling down the icon and move it back inside to the
   // original folder icon.
-  const float kIconTransformScale = 0.33333f;
-  gfx::Transform transform;
-  transform.Translate(scaled_rect_.x() - layer()->bounds().x(),
-                      scaled_rect_.y() - layer()->bounds().y());
-  transform.Scale(kIconTransformScale, kIconTransformScale);
+  gfx::Transform transform = gfx::GetRectTransform(bounds(), scaled_rect_);
 
   if (open_folder_) {
     // Transform to a scaled down icon inside the original folder icon.