Reenable triggering of screen rotations by sensors.

ui/gfx/compositor/layer_animator.cc

 // Copyright (c) 2011 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 "ui/gfx/compositor/layer_animator.h"
 
 #include "base/debug/trace_event.h"
 #include "base/logging.h"
 #include "base/memory/scoped_ptr.h"
 #include "ui/base/animation/animation_container.h"
@@ skipping 281 matching lines @@
 }
 
 void LayerAnimator::FinishAnimation(LayerAnimationSequence* sequence) {
   scoped_ptr<LayerAnimationSequence> removed(RemoveAnimation(sequence));
   sequence->Progress(sequence->duration(), delegate());
   ProcessQueue();
   UpdateAnimationState();
 }
 
 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()) {
       running_animations_copy[i].sequence->Progress(
           running_animations_copy[i].sequence->duration(), delegate());
       scoped_ptr<LayerAnimationSequence> removed(
           RemoveAnimation(running_animations_copy[i].sequence));
     }
   }
   ProcessQueue();
@@ skipping 213 matching lines @@
     ObserverListBase<LayerAnimationObserver>::Iterator it(observers_);
     LayerAnimationObserver* obs;
     while ((obs = it.GetNext()) != NULL) {
       sequence->AddObserver(obs);
     }
   }
   sequence->OnScheduled();
 }
 
 }  // namespace ui