Make blink platform time consistent with the timer virtual time

components/scheduler/base/task_queue_manager_delegate_for_test.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/task_queue_manager_delegate_for_test.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 
 namespace scheduler {
@@ skipping 33 matching lines @@
 }
 
 bool TaskQueueManagerDelegateForTest::IsNested() const {
   return false;
 }
 
 base::TimeTicks TaskQueueManagerDelegateForTest::NowTicks() {
   return time_source_->NowTicks();
 }
 
+double TaskQueueManagerDelegateForTest::CurrentTimeSeconds() const {
+  return (time_source_->NowTicks() - base::TimeTicks::UnixEpoch()).InSecondsF();
+}
+
 void TaskQueueManagerDelegateForTest::OnNoMoreImmediateWork() {}
 
 }  // namespace scheduler