Move responsiblity of tab suspending from renderer to TabManager

components/scheduler/renderer/renderer_scheduler_impl.cc

Index: components/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/components/scheduler/renderer/renderer_scheduler_impl.cc b/components/scheduler/renderer/renderer_scheduler_impl.cc
index 9f3d9b6ef21a16711e52ff193531d3459aed5064..a5d607e8ddb919a33f5bd68c63bf7e6640f26c71 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl.cc
@@ -62,10 +62,6 @@ RendererSchedulerImpl::RendererSchedulerImpl(
   end_renderer_hidden_idle_period_closure_.Reset(base::Bind(
       &RendererSchedulerImpl::EndIdlePeriod, weak_factory_.GetWeakPtr()));
 
-  suspend_timers_when_backgrounded_closure_.Reset(
-      base::Bind(&RendererSchedulerImpl::SuspendTimerQueueWhenBackgrounded,
-                 weak_factory_.GetWeakPtr()));
-
   default_loading_task_runner_ = NewLoadingTaskRunner("default_loading_tq");
   default_timer_task_runner_ = NewTimerTaskRunner("default_timer_tq");
 
@@ -351,6 +347,7 @@ void RendererSchedulerImpl::SetHasVisibleRenderWidgetWithTouchHandler(
   UpdatePolicyLocked(UpdateType::FORCE_UPDATE);
 }
 
+// TODO(hajimehoshi): This does nothing for now. Remove this handler.
 void RendererSchedulerImpl::OnRendererBackgrounded() {
   TRACE_EVENT0(TRACE_DISABLED_BY_DEFAULT("renderer.scheduler"),
                "RendererSchedulerImpl::OnRendererBackgrounded");
@@ -359,16 +356,6 @@ void RendererSchedulerImpl::OnRendererBackgrounded() {
     return;
 
   MainThreadOnly().renderer_backgrounded = true;
-  if (!MainThreadOnly().timer_queue_suspension_when_backgrounded_enabled)
-    return;
-
-  suspend_timers_when_backgrounded_closure_.Cancel();
-  base::TimeDelta suspend_timers_when_backgrounded_delay =
-      base::TimeDelta::FromMilliseconds(
-          kSuspendTimersWhenBackgroundedDelayMillis);
-  control_task_runner_->PostDelayedTask(
-      FROM_HERE, suspend_timers_when_backgrounded_closure_.callback(),
-      suspend_timers_when_backgrounded_delay);
 }
 
 void RendererSchedulerImpl::OnRendererForegrounded() {
@@ -379,10 +366,18 @@ void RendererSchedulerImpl::OnRendererForegrounded() {
     return;
 
   MainThreadOnly().renderer_backgrounded = false;
-  suspend_timers_when_backgrounded_closure_.Cancel();
   ResumeTimerQueueWhenForegrounded();
 }
 
+void RendererSchedulerImpl::OnRendererSuspend() {
+  helper_.CheckOnValidThread();
+  if (helper_.IsShutdown() || !MainThreadOnly().renderer_backgrounded)
+    return;
+  if (!MainThreadOnly().timer_queue_suspension_when_backgrounded_enabled)
+    return;
+  SuspendTimerQueueWhenBackgrounded();
+}
+
 void RendererSchedulerImpl::EndIdlePeriod() {
   if (MainThreadOnly().in_idle_period_for_testing)
     return;