CC Animation: Use std::bitset to update animation state.

cc/trees/layer_tree_host_impl.h

Index: cc/trees/layer_tree_host_impl.h
diff --git a/cc/trees/layer_tree_host_impl.h b/cc/trees/layer_tree_host_impl.h
index 418519be67bfc6c0d637437f112d1cfa42489ee1..ccbd9e7393ee42373e8fea65dfebf6b39727e481 100644
--- a/cc/trees/layer_tree_host_impl.h
+++ b/cc/trees/layer_tree_host_impl.h
@@ -286,18 +286,11 @@ class CC_EXPORT LayerTreeHostImpl
       ElementId element_id,
       ElementListType list_type,
       const gfx::ScrollOffset& scroll_offset) override;
-  void ElementTransformIsAnimatingChanged(ElementId element_id,
-                                          ElementListType list_type,
-                                          AnimationChangeType change_type,
-                                          bool is_animating) override;
-  void ElementOpacityIsAnimatingChanged(ElementId element_id,
-                                        ElementListType list_type,
-                                        AnimationChangeType change_type,
-                                        bool is_animating) override;
-  void ElementFilterIsAnimatingChanged(ElementId element_id,
-                                       ElementListType list_type,
-                                       AnimationChangeType change_type,
-                                       bool is_animating) override;
+  void ElementIsAnimatingChanged(ElementId element_id,
+                                 ElementListType list_type,
+                                 const PropertyAnimationState& mask,
+                                 const PropertyAnimationState& state) override;
+
   void ScrollOffsetAnimationFinished() override;
   gfx::ScrollOffset GetScrollOffsetForAnimation(
       ElementId element_id) const override;