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

ui/gfx/compositor/scoped_layer_animation_settings.cc

Index: ui/gfx/compositor/scoped_layer_animation_settings.cc
diff --git a/ui/gfx/compositor/scoped_layer_animation_settings.cc b/ui/gfx/compositor/scoped_layer_animation_settings.cc
index 7a7dbc14aab28a9175d3eac679b61ebbae5c8539..0b1221b3aa315243b68c9ab8dbe9f6f93799d2c8 100644
--- a/ui/gfx/compositor/scoped_layer_animation_settings.cc
+++ b/ui/gfx/compositor/scoped_layer_animation_settings.cc
@@ -19,12 +19,14 @@ namespace ui {
 ScopedLayerAnimationSettings::ScopedLayerAnimationSettings(
     LayerAnimator* animator)
     : animator_(animator),
-      old_transition_duration_(animator->transition_duration_) {
+      old_transition_duration_(animator->transition_duration_),
+      old_preemption_strategy_(animator->preemption_strategy_) {
   SetTransitionDuration(kDefaultTransitionDuration);
 }
 
 ScopedLayerAnimationSettings::~ScopedLayerAnimationSettings() {
   animator_->transition_duration_ = old_transition_duration_;
+  animator_->preemption_strategy_ = old_preemption_strategy_;
 
   for (std::set<ImplicitAnimationObserver*>::const_iterator i =
        observers_.begin(); i != observers_.end(); ++i) {
@@ -44,5 +46,10 @@ void ScopedLayerAnimationSettings::SetTransitionDuration(
   animator_->transition_duration_ = duration;
 }
 
+void ScopedLayerAnimationSettings::SetPreemptionStrategy(
+    LayerAnimator::PreemptionStrategy strategy) {
+  animator_->preemption_strategy_ = strategy;
+}
+
 }  // namespace ui