Provision to start base::SimpleTestTickClock at initial ticks

cc/scheduler/scheduler_unittest.cc

Index: cc/scheduler/scheduler_unittest.cc
diff --git a/cc/scheduler/scheduler_unittest.cc b/cc/scheduler/scheduler_unittest.cc
index 7f577a64c0ef0f602aae07f71a8bfea54eec6bf3..79dabad5c0f6f24c83a933fe9bff8dfb2aa3e060 100644
--- a/cc/scheduler/scheduler_unittest.cc
+++ b/cc/scheduler/scheduler_unittest.cc
@@ -239,10 +239,10 @@ class FakeExternalBeginFrameSource : public BeginFrameSourceBase {
 class SchedulerTest : public testing::Test {
  public:
   SchedulerTest()
-      : now_src_(new base::SimpleTestTickClock()),
+      : now_src_(new base::SimpleTestTickClock(
+            base::TimeTicks() + base::TimeDelta::FromMicroseconds(1))),
         task_runner_(new OrderedSimpleTaskRunner(now_src_.get(), true)),
         fake_external_begin_frame_source_(nullptr) {
-    now_src_->Advance(base::TimeDelta::FromMicroseconds(10000));
     // A bunch of tests require NowTicks()
     // to be > BeginFrameArgs::DefaultInterval()
     now_src_->Advance(base::TimeDelta::FromMilliseconds(100));