Debugging test failures from https://codereview.chromium.org/291843012/

ash/desktop_background/desktop_background_controller_unittest.cc

 // Copyright (c) 2012 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 "ash/desktop_background/desktop_background_controller.h"
 
 #include <cmath>
 #include <cstdlib>
 
 #include "ash/ash_switches.h"
@@ skipping 35 matching lines @@
 
 // Steps a widget's layer animation until it is completed. Animations must be
 // enabled.
 void RunAnimationForWidget(views::Widget* widget) {
   // Animations must be enabled for stepping to work.
   ASSERT_NE(ui::ScopedAnimationDurationScaleMode::duration_scale_mode(),
             ui::ScopedAnimationDurationScaleMode::ZERO_DURATION);
 
   ui::Layer* layer = widget->GetNativeView()->layer();
   ui::LayerAnimatorTestController controller(layer->GetAnimator());
-  gfx::AnimationContainerElement* element = layer->GetAnimator();
   // Multiple steps are required to complete complex animations.
   // TODO(vollick): This should not be necessary. crbug.com/154017
   while (controller.animator()->is_animating()) {
     controller.StartThreadedAnimationsIfNeeded();
     base::TimeTicks step_time = controller.animator()->last_step_time();
-    element->Step(step_time + base::TimeDelta::FromMilliseconds(1000));
+    layer->GetAnimator()->Step(step_time +
+                               base::TimeDelta::FromMilliseconds(1000));
   }
 }
 
 }  // namespace
 
 class DesktopBackgroundControllerTest : public test::AshTestBase {
  public:
   DesktopBackgroundControllerTest()
       : controller_(NULL) {
   }
@@ skipping 269 matching lines @@
 
   // Maximum width and height belongs to different displays.
   UpdateDisplay("400x300,100x500");
   EXPECT_EQ(
       "400x500",
       DesktopBackgroundController::GetMaxDisplaySizeInNative().ToString());
 }
 
 
 }  // namespace ash