[content]: Add CanExceedIdleDeadlineIfRequired function to RendererScheduler.

content/renderer/scheduler/renderer_scheduler_impl.cc

Index: content/renderer/scheduler/renderer_scheduler_impl.cc
diff --git a/content/renderer/scheduler/renderer_scheduler_impl.cc b/content/renderer/scheduler/renderer_scheduler_impl.cc
index 8cc3486935b8a1f903c3700c019b571d92a05599..fc4eb8de77ba0206b2f62fefb090f632815b9e8a 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl.cc
+++ b/content/renderer/scheduler/renderer_scheduler_impl.cc
@@ -500,6 +500,7 @@ void RendererSchedulerImpl::StartIdlePeriod(IdlePeriodState new_state) {
                            "RendererSchedulerIdlePeriod", this);
   DCHECK(main_thread_checker_.CalledOnValidThread());
   DCHECK(IsInIdlePeriod(new_state));
+
   renderer_task_queue_selector_->EnableQueue(
       IDLE_TASK_QUEUE, RendererTaskQueueSelector::BEST_EFFORT_PRIORITY);
   task_queue_manager_->PumpQueue(IDLE_TASK_QUEUE);
@@ -544,6 +545,12 @@ bool RendererSchedulerImpl::IsInIdlePeriod(IdlePeriodState state) {
   return state != IdlePeriodState::NOT_IN_IDLE_PERIOD;
 }
 
+bool RendererSchedulerImpl::CanExceedIdleDeadlineIfRequired() const {
+  DCHECK(main_thread_checker_.CalledOnValidThread());
+  return idle_period_state_ ==

[Sami, 2015/03/05 19:18:07]

Could you add a trace event here so we can see if we should make this also look
at the current time as a follow-up to avoid overruns?

[rmcilroy, 2015/03/16 22:08:04]

Done.

+         IdlePeriodState::IN_LONG_IDLE_PERIOD_WITH_MAX_DEADLINE;
+}
+
 void RendererSchedulerImpl::SetTimeSourceForTesting(
     scoped_refptr<cc::TestNowSource> time_source) {
   DCHECK(main_thread_checker_.CalledOnValidThread());