Experimental: Remove chromium shared timers

content/renderer/scheduler/renderer_scheduler_impl.h

Index: content/renderer/scheduler/renderer_scheduler_impl.h
diff --git a/content/renderer/scheduler/renderer_scheduler_impl.h b/content/renderer/scheduler/renderer_scheduler_impl.h
index c908a974a0d8f21cf24f8cb34d36fc053a1d68c8..508e3a0b90d870b9f55d0e41f5f54b190f4f2a0f 100644
--- a/content/renderer/scheduler/renderer_scheduler_impl.h
+++ b/content/renderer/scheduler/renderer_scheduler_impl.h
@@ -35,6 +35,7 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   scoped_refptr<base::SingleThreadTaskRunner> CompositorTaskRunner() override;
   scoped_refptr<SingleThreadIdleTaskRunner> IdleTaskRunner() override;
   scoped_refptr<base::SingleThreadTaskRunner> LoadingTaskRunner() override;
+  scoped_refptr<base::SingleThreadTaskRunner> TimerTaskRunner() override;
   void WillBeginFrame(const cc::BeginFrameArgs& args) override;
   void BeginFrameNotExpectedSoon() override;
   void DidCommitFrameToCompositor() override;
@@ -47,6 +48,8 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   void RemoveTaskObserver(
       base::MessageLoop::TaskObserver* task_observer) override;
   void Shutdown() override;
+  void SuspendTimerQueue() override;
+  void ResumeTimerQueue() override;
 
   void SetTimeSourceForTesting(scoped_refptr<cc::TestNowSource> time_source);
   void SetWorkBatchSizeForTesting(size_t work_batch_size);
@@ -59,6 +62,7 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
     DEFAULT_TASK_QUEUE,
     COMPOSITOR_TASK_QUEUE,
     LOADING_TASK_QUEUE,
+    TIMER_TASK_QUEUE,
     IDLE_TASK_QUEUE,
     CONTROL_TASK_QUEUE,
     CONTROL_TASK_AFTER_WAKEUP_QUEUE,
@@ -145,6 +149,9 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   void StartIdlePeriod();
   void EndIdlePeriod();
 
+  // Enables the timer queue if timer_queue_suspended_ is zero.
+  void MaybeEnableTimerQueue();
+
   base::TimeTicks Now() const;
 
   base::ThreadChecker main_thread_checker_;
@@ -155,6 +162,7 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   scoped_refptr<base::SingleThreadTaskRunner> default_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> compositor_task_runner_;
   scoped_refptr<base::SingleThreadTaskRunner> loading_task_runner_;
+  scoped_refptr<base::SingleThreadTaskRunner> timer_task_runner_;
   scoped_refptr<SingleThreadIdleTaskRunner> idle_task_runner_;
 
   base::Closure update_policy_closure_;
@@ -173,6 +181,7 @@ class CONTENT_EXPORT RendererSchedulerImpl : public RendererScheduler {
   blink::WebInputEvent::Type last_input_type_;
   InputStreamState input_stream_state_;
   PollableNeedsUpdateFlag policy_may_need_update_;
+  int timer_queue_suspended_;  // counter
 
   scoped_refptr<cc::TestNowSource> time_source_;