Provision to start base::SimpleTestTickClock at initial ticks

media/cast/net/rtcp/rtcp_unittest.cc

Index: media/cast/net/rtcp/rtcp_unittest.cc
diff --git a/media/cast/net/rtcp/rtcp_unittest.cc b/media/cast/net/rtcp/rtcp_unittest.cc
index f416f24d437f726aa25c0431c4c750f6912185d2..b66c19dc23b3fc01d253836260beb6ae6bbca108 100644
--- a/media/cast/net/rtcp/rtcp_unittest.cc
+++ b/media/cast/net/rtcp/rtcp_unittest.cc
@@ -99,7 +99,7 @@ class MockFrameSender {
 class RtcpTest : public ::testing::Test {
  protected:
   RtcpTest()
-      : sender_clock_(new base::SimpleTestTickClock()),
+      : sender_clock_(new base::SimpleTestTickClock(base::TimeTicks::Now())),
         receiver_clock_(new test::SkewedTickClock(sender_clock_.get())),
         sender_to_receiver_(sender_clock_.get()),
         receiver_to_sender_(sender_clock_.get()),
@@ -119,7 +119,6 @@ class RtcpTest : public ::testing::Test {
                            &receiver_to_sender_,
                            kReceiverSsrc,
                            kSenderSsrc) {
-    sender_clock_->Advance(base::TimeTicks::Now() - base::TimeTicks());
     receiver_clock_->SetSkew(
         1.0,  // No skew.
         base::TimeDelta::FromSeconds(kInitialReceiverClockOffsetSeconds));