cc: Main thread skip single layers instead of subtrees

cc/trees/property_tree.h

 // Copyright 2014 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.
 
 #ifndef CC_TREES_PROPERTY_TREE_H_
 #define CC_TREES_PROPERTY_TREE_H_
 
 #include <stddef.h>
 
 #include <unordered_map>
@@ skipping 247 matching lines @@
   EffectNodeData(const EffectNodeData& other);
 
   float opacity;
   float screen_space_opacity;
 
   bool has_render_surface;
   bool has_copy_request;
   bool has_background_filters;
   bool node_or_ancestor_has_background_filters;
   bool to_screen_opacity_is_animated;
+  bool to_screen_opacity_can_animate_on_impl;
   bool hidden_by_backface_visibility;
   bool double_sided;
   bool is_drawn;
   bool has_animated_opacity;
   // We need to track changes to effects on the compositor to compute damage
   // rect.
   bool effect_changed;
   int num_copy_requests_in_subtree;
   int transform_id;
   int clip_id;
@@ skipping 400 matching lines @@
 
  private:
   gfx::Vector2dF inner_viewport_container_bounds_delta_;
   gfx::Vector2dF outer_viewport_container_bounds_delta_;
   gfx::Vector2dF inner_viewport_scroll_bounds_delta_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_