Adds a flag to support "Virtual Time" to the blink scheduler

components/scheduler/child/scheduler_task_runner_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/child/scheduler_task_runner_delegate_for_test.h"
 
 #include "base/bind.h"
 #include "base/bind_helpers.h"
 #include "components/scheduler/base/nestable_task_runner_for_test.h"
 
 namespace scheduler {
 
 // static
 scoped_refptr<SchedulerTaskRunnerDelegateForTest>
 SchedulerTaskRunnerDelegateForTest::Create(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+    scoped_ptr<base::TickClock> time_source) {
   return make_scoped_refptr(
-      new SchedulerTaskRunnerDelegateForTest(task_runner));
+      new SchedulerTaskRunnerDelegateForTest(task_runner, time_source.Pass()));
 }
 
 SchedulerTaskRunnerDelegateForTest::SchedulerTaskRunnerDelegateForTest(
-    scoped_refptr<base::SingleThreadTaskRunner> task_runner)
-    : task_runner_(NestableTaskRunnerForTest::Create(task_runner)) {}
+    scoped_refptr<base::SingleThreadTaskRunner> task_runner,
+    scoped_ptr<base::TickClock> time_source)
+    : task_runner_(
+          NestableTaskRunnerForTest::Create(task_runner, time_source.Pass())) {}
 
 SchedulerTaskRunnerDelegateForTest::~SchedulerTaskRunnerDelegateForTest() {}
 
 void SchedulerTaskRunnerDelegateForTest::SetDefaultTaskRunner(
     scoped_refptr<base::SingleThreadTaskRunner> task_runner) {
   default_task_runner_ = task_runner.Pass();
 }
 
 void SchedulerTaskRunnerDelegateForTest::RestoreDefaultTaskRunner() {
   default_task_runner_ = nullptr;
@@ skipping 14 matching lines @@
 }
 
 bool SchedulerTaskRunnerDelegateForTest::RunsTasksOnCurrentThread() const {
   return task_runner_->RunsTasksOnCurrentThread();
 }
 
 bool SchedulerTaskRunnerDelegateForTest::IsNested() const {
   return task_runner_->IsNested();
 }
 
+base::TimeTicks SchedulerTaskRunnerDelegateForTest::NowTicks() {
+  return task_runner_->NowTicks();
+}
+
+void SchedulerTaskRunnerDelegateForTest::OnNoMoreWork() {}
+
 }  // namespace scheduler