Provision to start base::SimpleTestTickClock at initial ticks

media/cast/net/rtp/cast_message_builder_unittest.cc

Index: media/cast/net/rtp/cast_message_builder_unittest.cc
diff --git a/media/cast/net/rtp/cast_message_builder_unittest.cc b/media/cast/net/rtp/cast_message_builder_unittest.cc
index 25ec491e40640f1938e207c730966ef30b980a4d..2e7893296eeea18eea9a6dde27b5191418f50a43 100644
--- a/media/cast/net/rtp/cast_message_builder_unittest.cc
+++ b/media/cast/net/rtp/cast_message_builder_unittest.cc
@@ -85,21 +85,17 @@ class NackFeedbackVerification : public RtpPayloadFeedback {
 class CastMessageBuilderTest : public ::testing::Test {
  protected:
   CastMessageBuilderTest()
-      : framer_(&testing_clock_,
-                &feedback_,
-                kSsrc,
-                true,
-                10),
+      : framer_(&testing_clock_, &feedback_, kSsrc, true, 10),
         cast_msg_builder_(new CastMessageBuilder(&testing_clock_,
                                                  &feedback_,
                                                  &framer_,
                                                  kSsrc,
                                                  true,
-                                                 0)) {
+                                                 0)),
+        testing_clock_(base::TimeTicks() +
+                       base::TimeDelta::FromMilliseconds(kStartMillisecond)) {
     rtp_header_.sender_ssrc = kSsrc;
     rtp_header_.is_key_frame = false;
-    testing_clock_.Advance(
-        base::TimeDelta::FromMilliseconds(kStartMillisecond));
   }
 
   ~CastMessageBuilderTest() override {}