[cherrypick] Fix computation of runtime for throttled tasks

components/scheduler/base/real_time_domain.cc

Index: components/scheduler/base/real_time_domain.cc
diff --git a/components/scheduler/base/real_time_domain.cc b/components/scheduler/base/real_time_domain.cc
index 5c92648f17071a33ef512dc168d805a61c4ddbab..28c96affad71c924a14c9a823c0fdb8a921d2aac 100644
--- a/components/scheduler/base/real_time_domain.cc
+++ b/components/scheduler/base/real_time_domain.cc
@@ -26,6 +26,12 @@ LazyNow RealTimeDomain::CreateLazyNow() {
   return task_queue_manager_->CreateLazyNow();
 }
 
+base::TimeTicks RealTimeDomain::ComputeDelayedRunTime(
+    base::TimeTicks time_domain_now,
+    base::TimeDelta delay) const {
+  return time_domain_now + delay;
+}
+
 void RealTimeDomain::RequestWakeup(LazyNow* lazy_now, base::TimeDelta delay) {
   // NOTE this is only called if the scheduled runtime is sooner than any
   // previously scheduled runtime, or there is no (outstanding) previously