Revert of Move throttling of background timers into the renderer scheduler

components/scheduler/renderer/renderer_scheduler_impl.cc

 // Copyright 2014 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 "components/scheduler/renderer/renderer_scheduler_impl.h"
 
 #include "base/bind.h"
 #include "base/debug/stack_trace.h"
 #include "base/logging.h"
 #include "base/trace_event/trace_event.h"
 #include "base/trace_event/trace_event_argument.h"
 #include "cc/output/begin_frame_args.h"
 #include "components/scheduler/base/task_queue_impl.h"
 #include "components/scheduler/base/task_queue_selector.h"
-#include "components/scheduler/base/virtual_time_domain.h"
 #include "components/scheduler/child/scheduler_tqm_delegate.h"
 #include "components/scheduler/renderer/webthread_impl_for_renderer_scheduler.h"
 
 namespace scheduler {
 namespace {
 // The run time of loading tasks is strongly bimodal.  The vast majority are
 // very cheap, but there are usually a handful of very expensive tasks (e.g ~1
 // second on a mobile device) so we take a very pesimistic view when estimating
 // the cost of loading tasks.
 const int kLoadingTaskEstimationSampleCount = 1000;
 const double kLoadingTaskEstimationPercentile = 98;
 const int kTimerTaskEstimationSampleCount = 200;
 const double kTimerTaskEstimationPercentile = 90;
 const int kShortIdlePeriodDurationSampleCount = 10;
 const double kShortIdlePeriodDurationPercentile = 50;
 }
 
 RendererSchedulerImpl::RendererSchedulerImpl(
     scoped_refptr<SchedulerTqmDelegate> main_task_runner)
     : helper_(main_task_runner,
               "renderer.scheduler",
               TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
               TRACE_DISABLED_BY_DEFAULT("renderer.scheduler.debug")),
       idle_helper_(&helper_,
                    this,
                    "renderer.scheduler",
                    TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                    "RendererSchedulerIdlePeriod",
                    base::TimeDelta()),
-      throttling_helper_(this, "renderer.scheduler"),
       render_widget_scheduler_signals_(this),
       control_task_runner_(helper_.ControlTaskRunner()),
       compositor_task_runner_(
           helper_.NewTaskQueue(TaskQueue::Spec("compositor_tq")
                                    .SetShouldMonitorQuiescence(true))),
       delayed_update_policy_runner_(
           base::Bind(&RendererSchedulerImpl::UpdatePolicy,
                      base::Unretained(this)),
           helper_.ControlTaskRunner()),
       main_thread_only_(compositor_task_runner_,
@@ skipping 115 matching lines @@
 RendererSchedulerImpl::LoadingTaskRunner() {
   helper_.CheckOnValidThread();
   return default_loading_task_runner_;
 }
 
 scoped_refptr<TaskQueue> RendererSchedulerImpl::TimerTaskRunner() {
   helper_.CheckOnValidThread();
   return default_timer_task_runner_;
 }
 
-scoped_refptr<TaskQueue> RendererSchedulerImpl::ControlTaskRunner() {
-  helper_.CheckOnValidThread();
-  return helper_.ControlTaskRunner();
-}
-
 scoped_refptr<TaskQueue> RendererSchedulerImpl::NewLoadingTaskRunner(
     const char* name) {
   helper_.CheckOnValidThread();
   scoped_refptr<TaskQueue> loading_task_queue(helper_.NewTaskQueue(
       TaskQueue::Spec(name).SetShouldMonitorQuiescence(true)));
   loading_task_runners_.insert(loading_task_queue);
   loading_task_queue->SetQueuePriority(
       MainThreadOnly().current_policy.loading_queue_priority);
   loading_task_queue->AddTaskObserver(
       &MainThreadOnly().loading_task_cost_estimator);
@@ skipping 339 matching lines @@
   // Note: even though the control queue has the highest priority we don't yield
   // for it since these tasks are not user-provided work and they are only
   // intended to run before the next task, not interrupt the tasks.
   switch (MainThreadOnly().current_use_case) {
     case UseCase::COMPOSITOR_GESTURE:
     case UseCase::NONE:
       return MainThreadOnly().touchstart_expected_soon;
 
     case UseCase::MAIN_THREAD_GESTURE:
     case UseCase::SYNCHRONIZED_GESTURE:
-      return compositor_task_runner_->HasPendingImmediateTask() ||
+      return !compositor_task_runner_->IsQueueEmpty() ||
              MainThreadOnly().touchstart_expected_soon;
 
     case UseCase::TOUCHSTART:
       return true;
 
     case UseCase::LOADING:
       return false;
 
     default:
       NOTREACHED();
@@ skipping 490 matching lines @@
 
 double RendererSchedulerImpl::CurrentTimeSeconds() const {
   return helper_.scheduler_tqm_delegate()->CurrentTimeSeconds();
 }
 
 double RendererSchedulerImpl::MonotonicallyIncreasingTimeSeconds() const {
   return helper_.scheduler_tqm_delegate()->NowTicks().ToInternalValue() /
          static_cast<double>(base::Time::kMicrosecondsPerSecond);
 }
 
-void RendererSchedulerImpl::RegisterTimeDomain(TimeDomain* time_domain) {
-  helper_.RegisterTimeDomain(time_domain);
-}
-
-void RendererSchedulerImpl::UnregisterTimeDomain(TimeDomain* time_domain) {
-  helper_.UnregisterTimeDomain(time_domain);
-}
-
-base::TickClock* RendererSchedulerImpl::tick_clock() const {
-  return helper_.scheduler_tqm_delegate().get();
-}
-
 }  // namespace scheduler