Make blink platform time consistent with the timer virtual time

components/scheduler/child/virtual_time_tqm_delegate.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/child/virtual_time_tqm_delegate.h"
 
 namespace scheduler {
 
 // static
 scoped_refptr<VirtualTimeTqmDelegate> VirtualTimeTqmDelegate::Create(
@@ skipping 47 matching lines @@
 }
 
 bool VirtualTimeTqmDelegate::IsNested() const {
   return message_loop_->IsNested();
 }
 
 base::TimeTicks VirtualTimeTqmDelegate::NowTicks() {
   return now_;
 }
 
+double VirtualTimeTqmDelegate::CurrentTimeSeconds() const {
+  return (now_ - base::TimeTicks::UnixEpoch()).InSecondsF();
+}
+
 void VirtualTimeTqmDelegate::AdvancedTimeTo(base::TimeTicks now) {
   now_ = now;
   DCHECK_GE(now, now_);
   while (!delayed_wakeup_multimap_.empty()) {
     DelayedWakeupMultimap::iterator next_wakeup =
         delayed_wakeup_multimap_.begin();
     if (next_wakeup->first > now)
       break;
     message_loop_task_runner_->PostDelayedTask(FROM_HERE, next_wakeup->second,
                                                base::TimeDelta());
     delayed_wakeup_multimap_.erase(next_wakeup);
   }
 }
 
 void VirtualTimeTqmDelegate::OnNoMoreImmediateWork() {
   if (delayed_wakeup_multimap_.empty())
     return;
 
   AdvancedTimeTo(delayed_wakeup_multimap_.begin()->first);
 }
 
 }  // namespace scheduler