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 1dfb37d9d417fc9dc1da12970a4bcd7f0eacd9e3..300beb6426953043285159575f9a247f8ab96b06 100644
--- a/cc/scheduler/scheduler_unittest.cc
+++ b/cc/scheduler/scheduler_unittest.cc
@@ -257,7 +257,6 @@ class SchedulerTest : public testing::Test {
       : now_src_(new base::SimpleTestTickClock()),
         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));