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

components/scheduler/child/scheduler_task_runner_delegate_for_test.cc

Index: components/scheduler/child/scheduler_task_runner_delegate_for_test.cc
diff --git a/components/scheduler/child/scheduler_task_runner_delegate_for_test.cc b/components/scheduler/child/scheduler_task_runner_delegate_for_test.cc
index 4405d6d8011c31ec62f64be1ac5fb2199a85e705..0d7953d2254808697f37e37e9b937eb584327adc 100644
--- a/components/scheduler/child/scheduler_task_runner_delegate_for_test.cc
+++ b/components/scheduler/child/scheduler_task_runner_delegate_for_test.cc
@@ -13,14 +13,17 @@ 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() {}
 
@@ -55,4 +58,10 @@ bool SchedulerTaskRunnerDelegateForTest::IsNested() const {
   return task_runner_->IsNested();
 }
 
+base::TimeTicks SchedulerTaskRunnerDelegateForTest::NowTicks() {
+  return task_runner_->NowTicks();
+}
+
+void SchedulerTaskRunnerDelegateForTest::OnNoMoreWork() {}
+
 }  // namespace scheduler