Provision to start base::SimpleTestTickClock at initial ticks

media/base/null_video_sink_unittest.cc

Index: media/base/null_video_sink_unittest.cc
diff --git a/media/base/null_video_sink_unittest.cc b/media/base/null_video_sink_unittest.cc
index 996edc0fe8d154329574280f6a1d78ec122d69ab..ae394d451aead5df3ba48b3b10cc02158ba979fb 100644
--- a/media/base/null_video_sink_unittest.cc
+++ b/media/base/null_video_sink_unittest.cc
@@ -25,10 +25,10 @@ ACTION_P(RunClosure, closure) {
 class NullVideoSinkTest : public testing::Test,
                           public VideoRendererSink::RenderCallback {
  public:
-  NullVideoSinkTest() {
-    // Never use null TimeTicks since they have special connotations.
-    tick_clock_.Advance(base::TimeDelta::FromMicroseconds(12345));
-  }
+  NullVideoSinkTest()
+      :  // Never use null TimeTicks since they have special connotations.
+        tick_clock_(base::TimeTicks() +
+                    base::TimeDelta::FromMicroseconds(12345)) {}
   ~NullVideoSinkTest() override {}
 
   scoped_ptr<NullVideoSink> ConstructSink(bool clockless,