[Try # 3] Scheduler refactoring to virtually eliminate redundant DoWorks

third_party/WebKit/Source/platform/scheduler/base/virtual_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 "platform/scheduler/base/virtual_time_domain.h"
 
 #include "base/bind.h"
 #include "platform/scheduler/base/task_queue_impl.h"
 #include "platform/scheduler/base/task_queue_manager.h"
 #include "platform/scheduler/base/task_queue_manager_delegate.h"
@@ skipping 23 matching lines @@
   return now_;
 }
 
 void VirtualTimeDomain::RequestWakeup(base::TimeTicks now,
                                       base::TimeDelta delay) {
   // We don't need to do anything here because the caller of AdvanceTo is
   // responsible for calling TaskQueueManager::MaybeScheduleImmediateWork if
   // needed.
 }
 
-bool VirtualTimeDomain::MaybeAdvanceTime() {
-  return false;
+base::Optional<base::TimeDelta> VirtualTimeDomain::DelayTillNextTask(
+    LazyNow* lazy_now) {
+  return base::Optional<base::TimeDelta>();
 }
 
 void VirtualTimeDomain::AsValueIntoInternal(
     base::trace_event::TracedValue* state) const {}
 
 void VirtualTimeDomain::AdvanceTo(base::TimeTicks now) {
   base::AutoLock lock(lock_);
   DCHECK_GE(now, now_);
   now_ = now;
 }
 
 void VirtualTimeDomain::RequestDoWork() {
   task_queue_manager_->MaybeScheduleImmediateWork(FROM_HERE);
 }
 
 const char* VirtualTimeDomain::GetName() const {
   return "VirtualTimeDomain";
 }
 
 }  // namespace scheduler
 }  // namespace blink