[scheduler] Fix --disable-background-timer-throttling flag.

third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc

Index: third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
diff --git a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
index 0a0d3ced812966c3e058487b38a6532fe0d7bf09..55509d30b8418a9a13176c60cdbd1fbfc4507c83 100644
--- a/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
+++ b/third_party/WebKit/Source/platform/scheduler/renderer/renderer_scheduler_impl.cc
@@ -1155,8 +1155,10 @@ void RendererSchedulerImpl::UpdatePolicyLocked(UpdateType update_type) {
 
   // TODO(altimin): Consider adding default timer tq to background time
   // budget pool.
-  if (GetMainThreadOnly().renderer_backgrounded)
+  if (GetMainThreadOnly().renderer_backgrounded &&
+      RuntimeEnabledFeatures::timerThrottlingForBackgroundTabsEnabled()) {
     new_policy.timer_queue_policy.time_domain_type = TimeDomainType::THROTTLED;
+  }
 
   // Tracing is done before the early out check, because it's quite possible we
   // will otherwise miss this information in traces.