cc: one copy is default as well as final fallback.

cc/trees/layer_tree_settings.h

 // Copyright 2011 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_LAYER_TREE_SETTINGS_H_
 #define CC_TREES_LAYER_TREE_SETTINGS_H_
 
 #include "base/basictypes.h"
 #include "cc/base/cc_export.h"
 #include "cc/debug/layer_tree_debug_state.h"
@@ skipping 55 matching lines @@
   gfx::Size default_tile_size;
   gfx::Size max_untiled_layer_size;
   gfx::Size default_tile_grid_size;
   gfx::Size minimum_occlusion_tracking_size;
   size_t max_tiles_for_interest_area;
   float skewport_target_time_in_seconds;
   int skewport_extrapolation_limit_in_content_pixels;
   size_t max_unused_resource_memory_percentage;
   size_t max_memory_for_prepaint_percentage;
   bool strict_layer_property_change_checking;
-  bool use_one_copy;
   bool use_zero_copy;
   bool use_persistent_map_for_gpu_memory_buffers;
   bool enable_elastic_overscroll;
   unsigned use_image_texture_target;
   bool ignore_root_layer_flings;
   size_t scheduled_raster_task_limit;
   bool use_occlusion_for_tile_prioritization;
   bool record_full_layer;
   bool use_display_lists;
   bool verify_property_trees;
   bool gather_pixel_refs;
   bool use_compositor_animation_timelines;
   bool invert_viewport_scroll_order;
 
   LayerTreeDebugState initial_debug_state;
 
   SchedulerSettings ToSchedulerSettings() const;
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_SETTINGS_H_