Compact layout mananger animates windows rather than the default container layer.

ui/gfx/compositor/scoped_layer_animation_settings.h

Index: ui/gfx/compositor/scoped_layer_animation_settings.h
diff --git a/ui/gfx/compositor/scoped_layer_animation_settings.h b/ui/gfx/compositor/scoped_layer_animation_settings.h
index dce64ef4a6430250539d33addbf964f3f42d02b4..44a2f8b5d951b225c04ccc4963e7fef7f56c4cee 100644
--- a/ui/gfx/compositor/scoped_layer_animation_settings.h
+++ b/ui/gfx/compositor/scoped_layer_animation_settings.h
@@ -11,11 +11,11 @@
 #include "base/time.h"
 
 #include "ui/gfx/compositor/compositor_export.h"
+#include "ui/gfx/compositor/layer_animator.h"
 
 namespace ui {
 
 class ImplicitAnimationObserver;
-class LayerAnimator;
 class LayerAnimationObserver;
 
 // Scoped settings allow you to temporarily change the animator's settings and
@@ -29,10 +29,12 @@ class COMPOSITOR_EXPORT ScopedLayerAnimationSettings {
 
   void AddObserver(ImplicitAnimationObserver* observer);
   void SetTransitionDuration(base::TimeDelta duration);
+  void SetPreemptionStrategy(LayerAnimator::PreemptionStrategy strategy);
 
  private:
   LayerAnimator* animator_;
   base::TimeDelta old_transition_duration_;
+  LayerAnimator::PreemptionStrategy old_preemption_strategy_;
   std::set<ImplicitAnimationObserver*> observers_;
 
   DISALLOW_COPY_AND_ASSIGN(ScopedLayerAnimationSettings);