cc: Make animations tick regardless of drawing.

cc/animation/layer_animation_controller.cc

 // Copyright 2012 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 "cc/animation/layer_animation_controller.h"
 
 #include <algorithm>
 
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_registrar.h"
@@ skipping 156 matching lines @@
                            Animation::Transform,
                            monotonic_time);
       event.transform =
           animation->curve()->ToTransformAnimationCurve()->GetValue(
               monotonic_time);
       events->push_back(event);
     }
   }
 }
 
-void LayerAnimationController::UpdateState(AnimationEventsVector* events) {
+void LayerAnimationController::UpdateState(bool start_ready_animations,
+                                           AnimationEventsVector* events) {
   if (!HasActiveObserver())
     return;
 
-  PromoteStartedAnimations(last_tick_time_, events);
+  if (start_ready_animations)
+    PromoteStartedAnimations(last_tick_time_, events);
+
   MarkFinishedAnimations(last_tick_time_);
   MarkAnimationsForDeletion(last_tick_time_, events);
-  StartAnimationsWaitingForTargetAvailability(last_tick_time_);
-  PromoteStartedAnimations(last_tick_time_, events);
+
+  if (start_ready_animations) {
+    StartAnimationsWaitingForTargetAvailability(last_tick_time_);
+    PromoteStartedAnimations(last_tick_time_, events);
+  }
 
   AccumulatePropertyUpdates(last_tick_time_, events);
 
   UpdateActivation(NormalActivation);
 }
 
 void LayerAnimationController::AddAnimation(scoped_ptr<Animation> animation) {
   active_animations_.push_back(animation.Pass());
   UpdateActivation(NormalActivation);
 }
@@ skipping 421 matching lines @@
     ObserverListBase<LayerAnimationValueObserver>::Iterator it(observers_);
     LayerAnimationValueObserver* obs;
     while ((obs = it.GetNext()) != NULL)
       if (obs->IsActive())
         return true;
   }
   return false;
 }
 
 }  // namespace cc