cc : Track opacity animation changes on effect tree

cc/trees/property_tree.h

Index: cc/trees/property_tree.h
diff --git a/cc/trees/property_tree.h b/cc/trees/property_tree.h
index 26e780935228c4e2d0ee642698f973afb7968874..002bea1a37cd96105e6b5805d7c8bd326fe1f12f 100644
--- a/cc/trees/property_tree.h
+++ b/cc/trees/property_tree.h
@@ -285,7 +285,8 @@ struct CC_EXPORT EffectNodeData {
   // TODO(jaydasika) : Delete this after implementation of
   // SetHideLayerAndSubtree is cleaned up. (crbug.com/595843)
   bool subtree_hidden;
-  bool has_animated_opacity;
+  bool has_potential_opacity_animation;
+  bool is_currently_animating_opacity;
   // We need to track changes to effects on the compositor to compute damage
   // rect.
   bool effect_changed;