Add PERSISTENT_MAP usage for GpuMemoryBuffers.

cc/trees/layer_tree_settings.cc

 // 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.
 
 #include "cc/trees/layer_tree_settings.h"
 
 #include <GLES2/gl2.h>
 #include <limits>
 
 #include "base/command_line.h"
@@ skipping 43 matching lines @@
       use_pinch_virtual_viewport(false),
       tiling_interest_area_viewport_multiplier(9.0f),
       skewport_target_time_in_seconds(1.0f),
       skewport_extrapolation_limit_in_content_pixels(2000),
       max_unused_resource_memory_percentage(100),
       max_memory_for_prepaint_percentage(100),
       strict_layer_property_change_checking(false),
       use_one_copy(false),
       use_zero_copy(false),
       enable_elastic_overscroll(false),
-      use_image_texture_target(GL_TEXTURE_2D),
+      map_image_texture_target(GL_TEXTURE_2D),
+      persistent_map_image_texture_target(GL_TEXTURE_2D),
       ignore_root_layer_flings(false),
       scheduled_raster_task_limit(32),
       use_occlusion_for_tile_prioritization(false),
       record_full_layer(false),
       use_display_lists(false),
       use_cached_picture_in_display_list(true),
       verify_property_trees(false),
       gather_pixel_refs(false),
       use_compositor_animation_timelines(false) {
 }
@@ skipping 14 matching lines @@
   scheduler_settings.using_synchronous_renderer_compositor =
       using_synchronous_renderer_compositor;
   scheduler_settings.throttle_frame_production = throttle_frame_production;
   scheduler_settings.main_thread_should_always_be_low_latency = false;
   scheduler_settings.background_frame_interval =
       base::TimeDelta::FromSecondsD(1.0 / background_animation_rate);
   return scheduler_settings;
 }
 
 }  // namespace cc