Report expected task queueing time via UMA

components/scheduler/scheduler.gypi

 # Copyright 2015 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.
 
 {
   'variables': {
     'scheduler_common_sources': [
       # Sources list duplicated in GN build.
       'common/scheduler_switches.cc',
       'common/scheduler_switches.h',
@@ skipping 45 matching lines @@
       'child/webthread_base.cc',
       'child/webthread_base.h',
       'child/webthread_impl_for_worker_scheduler.cc',
       'child/webthread_impl_for_worker_scheduler.h',
       'child/worker_scheduler.cc',
       'child/worker_scheduler.h',
       'child/worker_scheduler_impl.cc',
       'child/worker_scheduler_impl.h',
       'renderer/auto_advancing_virtual_time_domain.cc',
       'renderer/auto_advancing_virtual_time_domain.h',
+      'renderer/coarse_duration_timer.cc',
+      'renderer/coarse_duration_timer.h',
       'renderer/deadline_task_runner.cc',
       'renderer/deadline_task_runner.h',
       'renderer/idle_time_estimator.cc',
       'renderer/idle_time_estimator.h',
+      'renderer/queueing_time_estimator.cc',
+      'renderer/queueing_time_estimator.h',
       'renderer/renderer_scheduler.cc',
       'renderer/renderer_scheduler.h',
       'renderer/renderer_scheduler_impl.cc',
       'renderer/renderer_scheduler_impl.h',
       'renderer/renderer_web_scheduler_impl.cc',
       'renderer/renderer_web_scheduler_impl.h',
       'renderer/render_widget_scheduling_state.cc',
       'renderer/render_widget_scheduling_state.h',
       'renderer/render_widget_signals.cc',
       'renderer/render_widget_signals.h',
@@ skipping 15 matching lines @@
     ],
     'scheduler_test_support_sources': [
       # Sources list duplicated in GN build.
       'test/lazy_scheduler_message_loop_delegate_for_tests.cc',
       'test/lazy_scheduler_message_loop_delegate_for_tests.h',
       'test/renderer_scheduler_test_support.h',
       'test/renderer_scheduler_test_support.cc',
     ],
   },
 }