reland -- Disable animations during aura tests.

ash/drag_drop/drag_drop_controller.cc

Index: ash/drag_drop/drag_drop_controller.cc
diff --git a/ash/drag_drop/drag_drop_controller.cc b/ash/drag_drop/drag_drop_controller.cc
index 2e43ea3813afe169f27e32a3c06039fb1dd64f76..255b0e2f13451e54b8ccdc49a7ccfb0fa3d05e2b 100644
--- a/ash/drag_drop/drag_drop_controller.cc
+++ b/ash/drag_drop/drag_drop_controller.cc
@@ -28,7 +28,7 @@ namespace {
 const gfx::Point kDragDropWidgetOffset(0, 0);
 const base::TimeDelta kDragDropAnimationDuration =
     base::TimeDelta::FromMilliseconds(250);
-}
+}  // namespace
 
 ////////////////////////////////////////////////////////////////////////////////
 // DragDropController, public:
@@ -47,11 +47,8 @@ DragDropController::DragDropController()
 DragDropController::~DragDropController() {
   Shell::GetInstance()->RemoveRootWindowEventFilter(this);
   Cleanup();
-  if (drag_image_.get()) {
-    aura::Window* window = drag_image_->GetWidget()->GetNativeView();
-    window->layer()->GetAnimator()->RemoveObserver(this);
+  if (drag_image_.get())
     drag_image_.reset();
-  }
 }
 
 int DragDropController::StartDragAndDrop(const ui::OSExchangeData& data,
@@ -206,14 +203,7 @@ ui::GestureStatus DragDropController::PreHandleGestureEvent(
 ////////////////////////////////////////////////////////////////////////////////
 // DragDropController, private:
 
-void DragDropController::OnLayerAnimationEnded(
-    const ui::LayerAnimationSequence* sequence) {
-  DCHECK(drag_image_.get());
-  drag_image_.reset();
-}
-
-void DragDropController::OnLayerAnimationAborted(
-    const ui::LayerAnimationSequence* sequence) {
+void DragDropController::OnImplicitAnimationsCompleted() {
   DCHECK(drag_image_.get());
   drag_image_.reset();
 }
@@ -223,9 +213,13 @@ void DragDropController::StartCanceledAnimation() {
   ui::LayerAnimator* animator = window->layer()->GetAnimator();
   animator->set_preemption_strategy(
       ui::LayerAnimator::IMMEDIATELY_ANIMATE_TO_NEW_TARGET);
-  animator->AddObserver(this);
+
+  // Stop waiting for any as yet unfinished implicit animations.
+  StopObservingImplicitAnimations();
+
   ui::ScopedLayerAnimationSettings animation_setter(animator);
   animation_setter.SetTransitionDuration(kDragDropAnimationDuration);
+  animation_setter.AddObserver(this);
   window->SetBounds(gfx::Rect(drag_start_location_, window->bounds().size()));
 }