cc: Remove support for disabling non-root render surfaces.

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 <memory>
@@ skipping 561 matching lines @@
       element_id_to_scroll_node_index;
   std::unordered_map<ElementId, int, ElementIdHash>
       element_id_to_transform_node_index;
 
   std::vector<int> always_use_active_tree_opacity_effect_ids;
   TransformTree transform_tree;
   EffectTree effect_tree;
   ClipTree clip_tree;
   ScrollTree scroll_tree;
   bool needs_rebuild;
-  bool non_root_surfaces_enabled;
   // Change tracking done on property trees needs to be preserved across commits
   // (when they are not rebuild). We cache a global bool which stores whether
   // we did any change tracking so that we can skip copying the change status
   // between property trees when this bool is false.
   bool changed;
   // We cache a global bool for full tree damages to avoid walking the entire
   // tree.
   // TODO(jaydasika): Changes to transform and effects that damage the entire
   // tree should be tracked by this bool. Currently, they are tracked by the
   // individual nodes.
@@ skipping 60 matching lines @@
   DrawTransforms& GetDrawTransforms(int transform_id, int effect_id) const;
   DrawTransformData& FetchDrawTransformsDataFromCache(int transform_id,
                                                       int effect_id) const;
 
   PropertyTreesCachedData cached_data_;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_PROPERTY_TREE_H_