[Cherrypick try #2] Fix computation of runtime for throttled tasks

components/scheduler/base/real_time_domain.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/scheduler/base/real_time_domain.h"
 
 #include "base/bind.h"
 #include "components/scheduler/base/task_queue_impl.h"
 #include "components/scheduler/base/task_queue_manager.h"
 #include "components/scheduler/base/task_queue_manager_delegate.h"
 
 namespace scheduler {
 
 RealTimeDomain::RealTimeDomain()
     : TimeDomain(nullptr), task_queue_manager_(nullptr) {}
 
 RealTimeDomain::~RealTimeDomain() {}
 
 void RealTimeDomain::OnRegisterWithTaskQueueManager(
     TaskQueueManager* task_queue_manager) {
   task_queue_manager_ = task_queue_manager;
   DCHECK(task_queue_manager_);
 }
 
 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
   // scheduled runtime.
   task_queue_manager_->MaybeScheduleDelayedWork(FROM_HERE, lazy_now, delay);
 }
 
 bool RealTimeDomain::MaybeAdvanceTime() {
   base::TimeTicks next_run_time;
   if (!NextScheduledRunTime(&next_run_time))
     return false;
 
   LazyNow lazy_now = task_queue_manager_->CreateLazyNow();
   if (lazy_now.Now() >= next_run_time)
     return true;  // Causes DoWork to post a continuation.
 
   // The next task is sometime in the future, make sure we schedule a DoWork to
   // run it.
   task_queue_manager_->MaybeScheduleDelayedWork(FROM_HERE, &lazy_now,
                                                 next_run_time - lazy_now.Now());
   return false;
 }
 
 void RealTimeDomain::AsValueIntoInternal(
     base::trace_event::TracedValue* state) const {}
 
 const char* RealTimeDomain::GetName() const {
   return "RealTimeDomain";
 }
-
 }  // namespace scheduler