Provision to start base::SimpleTestTickClock at initial ticks

media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc

Index: media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
diff --git a/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc b/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
index 73ddd623dc90f9dfdeee9d3f6c4da815f0a736d4..f0f5dc2629d20a2d1ed5b7fb36e54cf39395d361 100644
--- a/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
+++ b/media/cast/logging/receiver_time_offset_estimator_impl_unittest.cc
@@ -22,13 +22,14 @@ namespace cast {
 class ReceiverTimeOffsetEstimatorImplTest : public ::testing::Test {
  protected:
   ReceiverTimeOffsetEstimatorImplTest()
-      : sender_clock_(new base::SimpleTestTickClock()),
+      : sender_clock_(new base::SimpleTestTickClock(base::TimeTicks())),
         task_runner_(new test::FakeSingleThreadTaskRunner(sender_clock_)),
         cast_environment_(
             new CastEnvironment(scoped_ptr<base::TickClock>(sender_clock_),
                                 task_runner_,
                                 task_runner_,
-                                task_runner_)) {
+                                task_runner_)),
+        receiver_clock_(base::TimeTicks()) {
     cast_environment_->logger()->Subscribe(&estimator_);
   }