CC Animation: Introduce some dirty flags to optimize PushProperties on commit

cc/animation/scroll_offset_animations.cc

Index: cc/animation/scroll_offset_animations.cc
diff --git a/cc/animation/scroll_offset_animations.cc b/cc/animation/scroll_offset_animations.cc
index 04cf954c6f27ad286dafc83fb3f076a9c81c338c..c70abbc9299cc28f73cd4031a94b39fe3c1c6ca1 100644
--- a/cc/animation/scroll_offset_animations.cc
+++ b/cc/animation/scroll_offset_animations.cc
@@ -33,7 +33,7 @@ void ScrollOffsetAnimations::AddAdjustmentUpdate(ElementId element_id,
   ScrollOffsetAnimationUpdate update = GetUpdateForElementId(element_id);
   update.adjustment_ += adjustment;
   element_to_update_map_[element_id] = update;
-  animation_host_->SetNeedsCommit();
+  animation_host_->SetNeedsPushProperties();
 }
 
 void ScrollOffsetAnimations::AddTakeoverUpdate(ElementId element_id) {
@@ -41,7 +41,7 @@ void ScrollOffsetAnimations::AddTakeoverUpdate(ElementId element_id) {
   ScrollOffsetAnimationUpdate update = GetUpdateForElementId(element_id);
   update.takeover_ = true;
   element_to_update_map_[element_id] = update;
-  animation_host_->SetNeedsCommit();
+  animation_host_->SetNeedsPushProperties();
 }
 
 bool ScrollOffsetAnimations::HasUpdatesForTesting() const {