Animations: Implement runtime flag for enabling compositor animation timelines.

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 53 matching lines @@
       use_one_copy(false),
       use_zero_copy(false),
       enable_elastic_overscroll(false),
       use_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),
       verify_property_trees(false),
-      gather_pixel_refs(false) {
+      gather_pixel_refs(false),
+      use_compositor_animation_timelines(false) {
 }
 
 LayerTreeSettings::~LayerTreeSettings() {}
 
 SchedulerSettings LayerTreeSettings::ToSchedulerSettings() const {
   SchedulerSettings scheduler_settings;
   scheduler_settings.use_external_begin_frame_source =
       use_external_begin_frame_source;
   scheduler_settings.main_frame_before_activation_enabled =
       main_frame_before_activation_enabled;
   scheduler_settings.impl_side_painting = impl_side_painting;
   scheduler_settings.timeout_and_draw_when_animation_checkerboards =
       timeout_and_draw_when_animation_checkerboards;
   scheduler_settings.maximum_number_of_failed_draws_before_draw_is_forced_ =
       maximum_number_of_failed_draws_before_draw_is_forced_;
   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