Suspend more task queues for background renderers (experimental)

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 5add212d251922ed56c12f00ebc0a7a214e913e9..6292013f7ae0ba8458337964a256856c67b210b9 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl.cc
@@ -121,6 +121,7 @@ RendererSchedulerImpl::MainThreadOnly::MainThreadOnly(
       renderer_backgrounded(false),
       timer_queue_suspension_when_backgrounded_enabled(false),
       timer_queue_suspended_when_backgrounded(false),
+      queue_suspended(false),
       was_shutdown(false),
       loading_tasks_seem_expensive(false),
       timer_tasks_seem_expensive(false),
@@ -832,6 +833,12 @@ void RendererSchedulerImpl::UpdatePolicyLocked(UpdateType update_type) {
     new_policy.timer_queue_policy.is_enabled = false;
   }
 
+  if (MainThreadOnly().queue_suspended) {
+    new_policy.compositor_queue_policy.is_enabled = false;
+    new_policy.loading_queue_policy.is_enabled = false;
+    new_policy.control_queue_policy.is_enabled = false;
+  }
+
   // Tracing is done before the early out check, because it's quite possible we
   // will otherwise miss this information in traces.
   TRACE_EVENT_OBJECT_SNAPSHOT_WITH_ID(
@@ -882,7 +889,13 @@ void RendererSchedulerImpl::UpdatePolicyLocked(UpdateType update_type) {
                        MainThreadOnly().current_policy.default_queue_policy,
                        new_policy.default_queue_policy);
 
-  DCHECK(compositor_task_runner_->IsQueueEnabled());
+  ApplyTaskQueuePolicy(helper_.ControlTaskRunner().get(),
+                       MainThreadOnly().current_policy.control_queue_policy,
+                       new_policy.control_queue_policy);
+  ApplyTaskQueuePolicy(helper_.ControlAfterWakeUpTaskRunner().get(),
+                       MainThreadOnly().current_policy.control_queue_policy,
+                       new_policy.control_queue_policy);
+
   MainThreadOnly().current_policy = new_policy;
 }
 
@@ -1214,6 +1227,7 @@ void RendererSchedulerImpl::SuspendTimerQueueWhenBackgrounded() {
     return;
 
   MainThreadOnly().timer_queue_suspended_when_backgrounded = true;
+  MainThreadOnly().queue_suspended = true;
   ForceUpdatePolicy();
 }
 
@@ -1223,6 +1237,7 @@ void RendererSchedulerImpl::ResumeTimerQueueWhenForegrounded() {
     return;
 
   MainThreadOnly().timer_queue_suspended_when_backgrounded = false;
+  MainThreadOnly().queue_suspended = false;
   ForceUpdatePolicy();
 }