Provision to start base::SimpleTestTickClock at initial ticks

components/scheduler/child/scheduler_helper_unittest.cc

Index: components/scheduler/child/scheduler_helper_unittest.cc
diff --git a/components/scheduler/child/scheduler_helper_unittest.cc b/components/scheduler/child/scheduler_helper_unittest.cc
index 85c811aa86ece8aa1760e5893aa544c18bffec0c..9b1c07204e221350e3b027c775bf9a3eeb48c875 100644
--- a/components/scheduler/child/scheduler_helper_unittest.cc
+++ b/components/scheduler/child/scheduler_helper_unittest.cc
@@ -44,7 +44,8 @@ void AppendToVectorReentrantTask(base::SingleThreadTaskRunner* task_runner,
 class SchedulerHelperTest : public testing::Test {
  public:
   SchedulerHelperTest()
-      : clock_(new base::SimpleTestTickClock()),
+      : clock_(new base::SimpleTestTickClock(
+            base::TimeTicks() + base::TimeDelta::FromMicroseconds(1))),
         mock_task_runner_(new cc::OrderedSimpleTaskRunner(clock_.get(), false)),
         nestable_task_runner_(
             NestableTaskRunnerForTest::Create(mock_task_runner_)),
@@ -55,7 +56,6 @@ class SchedulerHelperTest : public testing::Test {
                                 TRACE_DISABLED_BY_DEFAULT("test.scheduler.dbg"),
                                 SchedulerHelper::TASK_QUEUE_COUNT)),
         default_task_runner_(scheduler_helper_->DefaultTaskRunner()) {
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     scheduler_helper_->SetTimeSourceForTesting(
         make_scoped_ptr(new TestTimeSource(clock_.get())));
     scheduler_helper_->GetTaskQueueManagerForTesting()->SetTimeSourceForTesting(