Make SingleThreadProxy a SchedulerClient

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 <limits>
 
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/strings/string_number_conversions.h"
 
 namespace cc {
 
 LayerTreeSettings::LayerTreeSettings()
     : impl_side_painting(false),
       allow_antialiasing(true),
       throttle_frame_production(true),
+      single_thread_proxy_scheduler(true),
       begin_frame_scheduling_enabled(false),
       main_frame_before_draw_enabled(true),
       main_frame_before_activation_enabled(false),
       using_synchronous_renderer_compositor(false),
       report_overscroll_only_for_scrollable_axes(false),
       per_tile_painting_enabled(false),
       partial_swap_enabled(false),
       accelerated_animation_enabled(true),
       can_use_lcd_text(true),
       should_clear_root_render_pass(true),
@@ skipping 34 matching lines @@
       ignore_root_layer_flings(false),
       use_rgba_4444_textures(false),
       touch_hit_testing(true),
       texture_id_allocation_chunk_size(64),
       use_occlusion_for_tile_prioritization(false) {
 }
 
 LayerTreeSettings::~LayerTreeSettings() {}
 
 }  // namespace cc