Hook up ui::Compositor to Display's BeginFrameSource

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 <stddef.h>
 #include <limits>
 
@@ skipping 39 matching lines @@
       return LayerTreeSettings::ScrollbarAnimator::NO_ANIMATOR;
   }
   return LayerTreeSettings::ScrollbarAnimator::NO_ANIMATOR;
 }
 
 }  // namespace
 
 LayerTreeSettings::LayerTreeSettings()
     : single_thread_proxy_scheduler(true),
       use_external_begin_frame_source(false),
+      use_output_surface_begin_frame_source(false),
       main_frame_before_activation_enabled(false),
       using_synchronous_renderer_compositor(false),
       can_use_lcd_text(true),
       use_distance_field_text(false),
       gpu_rasterization_enabled(false),
       gpu_rasterization_forced(false),
       gpu_rasterization_msaa_sample_count(0),
       gpu_rasterization_skewport_target_time_in_seconds(0.2f),
       create_low_res_tiling(false),
       scrollbar_animator(NO_ANIMATOR),
@@ skipping 241 matching lines @@
       using_synchronous_renderer_compositor;
   scheduler_settings.throttle_frame_production = wait_for_beginframe_interval;
   scheduler_settings.background_frame_interval =
       base::TimeDelta::FromSecondsD(1.0 / background_animation_rate);
   scheduler_settings.abort_commit_before_output_surface_creation =
       abort_commit_before_output_surface_creation;
   return scheduler_settings;
 }
 
 }  // namespace cc