Provision to start base::SimpleTestTickClock at initial ticks

components/scheduler/renderer/renderer_scheduler_impl_unittest.cc

Index: components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
diff --git a/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc b/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
index e18428dbbc3169a0de2546a9632c0fa8f390a43e..e16e683fc4bdc5525a655eeba6530def5b24fc0f 100644
--- a/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
+++ b/components/scheduler/renderer/renderer_scheduler_impl_unittest.cc
@@ -184,14 +184,10 @@ class RendererSchedulerImplTest : public testing::Test {
  public:
   using Policy = RendererSchedulerImpl::Policy;
 
-  RendererSchedulerImplTest() : clock_(new base::SimpleTestTickClock()) {
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
-  }
+  RendererSchedulerImplTest() : clock_(new base::SimpleTestTickClock()) {}
 
   RendererSchedulerImplTest(base::MessageLoop* message_loop)
-      : clock_(new base::SimpleTestTickClock()), message_loop_(message_loop) {
-    clock_->Advance(base::TimeDelta::FromMicroseconds(5000));
-  }
+      : clock_(new base::SimpleTestTickClock()), message_loop_(message_loop) {}
 
   ~RendererSchedulerImplTest() override {}