cc: Add flag to disable future mask tiling.

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 "third_party/khronos/GLES2/gl2.h"
 
 namespace cc {
 
@@ skipping 59 matching lines @@
          ignore_root_layer_flings == other.ignore_root_layer_flings &&
          scheduled_raster_task_limit == other.scheduled_raster_task_limit &&
          use_occlusion_for_tile_prioritization ==
              other.use_occlusion_for_tile_prioritization &&
          verify_clip_tree_calculations == other.verify_clip_tree_calculations &&
          image_decode_tasks_enabled == other.image_decode_tasks_enabled &&
          max_staging_buffer_usage_in_bytes ==
              other.max_staging_buffer_usage_in_bytes &&
          gpu_memory_policy == other.gpu_memory_policy &&
          software_memory_policy == other.software_memory_policy &&
+         enable_mask_tiling == other.enable_mask_tiling &&
          LayerTreeDebugState::Equal(initial_debug_state,
                                     other.initial_debug_state);
 }
 
 SchedulerSettings LayerTreeSettings::ToSchedulerSettings() const {
   SchedulerSettings scheduler_settings;
   scheduler_settings.main_frame_before_activation_enabled =
       main_frame_before_activation_enabled;
   scheduler_settings.timeout_and_draw_when_animation_checkerboards =
       timeout_and_draw_when_animation_checkerboards;
   scheduler_settings.using_synchronous_renderer_compositor =
       using_synchronous_renderer_compositor;
   scheduler_settings.enable_latency_recovery = enable_latency_recovery;
   scheduler_settings.background_frame_interval =
       base::TimeDelta::FromSecondsD(1.0 / background_animation_rate);
   return scheduler_settings;
 }
 
 TileManagerSettings LayerTreeSettings::ToTileManagerSettings() const {
   TileManagerSettings tile_manager_settings;
   tile_manager_settings.use_partial_raster = use_partial_raster;
   tile_manager_settings.check_tile_priority_inversion =
       check_tile_priority_inversion;
   tile_manager_settings.enable_checker_imaging = enable_checker_imaging;
   return tile_manager_settings;
 }
 
 }  // namespace cc