Reland of Add a flags field to video timing extension.

webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc b/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
index 3e6e4529d8b6bd54acc13b1cf55dc61f384634c4..14bbff781c50bfc3fc4ebff9b43da808043298ac 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_sender_unittest.cc
@@ -11,6 +11,7 @@
 #include <memory>
 #include <vector>
 
+#include "webrtc/api/video/video_timing.h"
 #include "webrtc/logging/rtc_event_log/mock/mock_rtc_event_log.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_cvo.h"
 #include "webrtc/modules/rtp_rtcp/include/rtp_header_extension_map.h"
@@ -994,7 +995,7 @@ TEST_P(RtpSenderTest, NoFlexfecForTimingFrames) {
                                             0, 1500));
   RTPVideoHeader video_header;
   memset(&video_header, 0, sizeof(RTPVideoHeader));
-  video_header.video_timing.is_timing_frame = true;
+  video_header.video_timing.flags = TimingFrameFlags::kTriggeredByTimer;
   EXPECT_TRUE(rtp_sender_->SendOutgoingData(
       kVideoFrameKey, kPayloadType, kTimestamp, kCaptureTimeMs, kPayloadData,
       sizeof(kPayloadData), nullptr, &video_header, nullptr));
@@ -1019,7 +1020,7 @@ TEST_P(RtpSenderTest, NoFlexfecForTimingFrames) {
   EXPECT_CALL(mock_paced_sender_,
               InsertPacket(RtpPacketSender::kLowPriority, kMediaSsrc,
                            kSeqNum + 1, _, _, false));
-  video_header.video_timing.is_timing_frame = false;
+  video_header.video_timing.flags = TimingFrameFlags::kInvalid;
   EXPECT_TRUE(rtp_sender_->SendOutgoingData(
       kVideoFrameKey, kPayloadType, kTimestamp + 1, kCaptureTimeMs + 1,
       kPayloadData, sizeof(kPayloadData), nullptr, &video_header, nullptr));
@@ -1571,7 +1572,7 @@ TEST_P(RtpSenderVideoTest, TimingFrameHasPacketizationTimstampSet) {
   const int64_t kCaptureTimestamp = fake_clock_.TimeInMilliseconds();
 
   RTPVideoHeader hdr = {0};
-  hdr.video_timing.is_timing_frame = true;
+  hdr.video_timing.flags = TimingFrameFlags::kTriggeredByTimer;
   hdr.video_timing.encode_start_delta_ms = kEncodeStartDeltaMs;
   hdr.video_timing.encode_finish_delta_ms = kEncodeFinishDeltaMs;