Provision to start base::SimpleTestTickClock at initial ticks

components/scheduler/child/idle_helper_unittest.cc

Index: components/scheduler/child/idle_helper_unittest.cc
diff --git a/components/scheduler/child/idle_helper_unittest.cc b/components/scheduler/child/idle_helper_unittest.cc
index 20ae1b5c0937dadc371dd1f0f498558d83102a86..e3f7f01c54534bac3a870952f973b4cdec0bb042 100644
--- a/components/scheduler/child/idle_helper_unittest.cc
+++ b/components/scheduler/child/idle_helper_unittest.cc
@@ -167,7 +167,8 @@ class BaseIdleHelperTest : public testing::Test {
   BaseIdleHelperTest(
       base::MessageLoop* message_loop,
       base::TimeDelta required_quiescence_duration_before_long_idle_period)
-      : clock_(new base::SimpleTestTickClock()),
+      : clock_(new base::SimpleTestTickClock(
+            base::TimeTicks() + base::TimeDelta::FromMicroseconds(1))),
         mock_task_runner_(
             message_loop
                 ? nullptr
@@ -187,7 +188,6 @@ class BaseIdleHelperTest : public testing::Test {
             required_quiescence_duration_before_long_idle_period)),
         default_task_runner_(scheduler_helper_->DefaultTaskRunner()),
         idle_task_runner_(idle_helper_->IdleTaskRunner()) {
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
     scheduler_helper_->SetTimeSourceForTesting(
         make_scoped_ptr(new TestTimeSource(clock_.get())));
     scheduler_helper_->GetTaskQueueManagerForTesting()->SetTimeSourceForTesting(