Provision to start base::SimpleTestTickClock at initial ticks

media/cast/net/rtcp/rtcp_builder_unittest.cc

Index: media/cast/net/rtcp/rtcp_builder_unittest.cc
diff --git a/media/cast/net/rtcp/rtcp_builder_unittest.cc b/media/cast/net/rtcp/rtcp_builder_unittest.cc
index 1c44268e8c52aa4f285648e10abdc1bbb468decf..600177db7d8ff9c8a96f15060d602b3761704c1b 100644
--- a/media/cast/net/rtcp/rtcp_builder_unittest.cc
+++ b/media/cast/net/rtcp/rtcp_builder_unittest.cc
@@ -192,8 +192,8 @@ TEST_F(RtcpBuilderTest, RtcpReceiverReportWithRrtrCastMessageAndLog) {
                                     &report_block, &rrtr, &cast_message,
                                     &rtcp_events, kDefaultDelay));
 
-  base::SimpleTestTickClock testing_clock;
-  testing_clock.Advance(base::TimeDelta::FromMilliseconds(kTimeBaseMs));
+  base::SimpleTestTickClock testing_clock(
+      base::TimeTicks() + base::TimeDelta::FromMilliseconds(kTimeBaseMs));
 
   p.AddReceiverLog(kSendingSsrc);
   p.AddReceiverFrameLog(kRtpTimestamp, 2, kTimeBaseMs);
@@ -233,8 +233,8 @@ TEST_F(RtcpBuilderTest, RtcpReceiverReportWithOversizedFrameLog) {
 
   RtcpReportBlock report_block = GetReportBlock();
 
-  base::SimpleTestTickClock testing_clock;
-  testing_clock.Advance(base::TimeDelta::FromMilliseconds(kTimeBaseMs));
+  base::SimpleTestTickClock testing_clock(
+      base::TimeTicks() + base::TimeDelta::FromMilliseconds(kTimeBaseMs));
 
   p.AddReceiverLog(kSendingSsrc);
 
@@ -282,8 +282,8 @@ TEST_F(RtcpBuilderTest, RtcpReceiverReportWithTooManyLogFrames) {
 
   RtcpReportBlock report_block = GetReportBlock();
 
-  base::SimpleTestTickClock testing_clock;
-  testing_clock.Advance(base::TimeDelta::FromMilliseconds(kTimeBaseMs));
+  base::SimpleTestTickClock testing_clock(
+      base::TimeTicks() + base::TimeDelta::FromMilliseconds(kTimeBaseMs));
 
   p.AddReceiverLog(kSendingSsrc);
 
@@ -323,8 +323,8 @@ TEST_F(RtcpBuilderTest, RtcpReceiverReportWithOldLogFrames) {
 
   RtcpReportBlock report_block = GetReportBlock();
 
-  base::SimpleTestTickClock testing_clock;
-  testing_clock.Advance(base::TimeDelta::FromMilliseconds(kTimeBaseMs));
+  base::SimpleTestTickClock testing_clock(
+      base::TimeTicks() + base::TimeDelta::FromMilliseconds(kTimeBaseMs));
 
   p.AddReceiverLog(kSendingSsrc);
 
@@ -363,8 +363,8 @@ TEST_F(RtcpBuilderTest, RtcpReceiverReportRedundancy) {
 
   RtcpReportBlock report_block = GetReportBlock();
 
-  base::SimpleTestTickClock testing_clock;
-  testing_clock.Advance(base::TimeDelta::FromMilliseconds(time_base_ms));
+  base::SimpleTestTickClock testing_clock(
+      base::TimeTicks() + base::TimeDelta::FromMilliseconds(time_base_ms));
 
   ReceiverRtcpEventSubscriber event_subscriber(500, VIDEO_EVENT);
   size_t packet_count = kNumResends * kResendDelay + 10;