Reenable triggering of screen rotations by sensors.

ui/gfx/compositor/layer_animator.cc

Index: ui/gfx/compositor/layer_animator.cc
diff --git a/ui/gfx/compositor/layer_animator.cc b/ui/gfx/compositor/layer_animator.cc
index 1ec2b78ee0bb02ff6a95307d11244b3bf0544c0a..daa59c1b7d3bb7d95a9914a65242ad4be9dde798 100644
--- a/ui/gfx/compositor/layer_animator.cc
+++ b/ui/gfx/compositor/layer_animator.cc
@@ -299,8 +299,9 @@ void LayerAnimator::FinishAnimation(LayerAnimationSequence* sequence) {
 }
 
 void LayerAnimator::FinishAnyAnimationWithZeroDuration() {
-  // We need to make a copy because Progress may indirectly cause new animations
-  // to start running.
+  // Special case: if we've started a 0 duration animation, just finish it now
+  // and get rid of it. We need to make a copy because Progress may indirectly
+  // cause new animations to start running.
   RunningAnimations running_animations_copy = running_animations_;
   for (size_t i = 0; i < running_animations_copy.size(); ++i) {
     if (running_animations_copy[i].sequence->duration() == base::TimeDelta()) {