Implement RTP keepalive in native stack.

webrtc/video/replay.cc

Index: webrtc/video/replay.cc
diff --git a/webrtc/video/replay.cc b/webrtc/video/replay.cc
index 6f4ce678f083ab649453f9c12a015f2b8ce61c14..25c71c42ef5a48e0ccbdfcfae90a2dbdaa7aa9ca 100644
--- a/webrtc/video/replay.cc
+++ b/webrtc/video/replay.cc
@@ -302,8 +302,8 @@ void RtpReplay() {
         std::unique_ptr<RtpHeaderParser> parser(RtpHeaderParser::Create());
         parser->Parse(packet.data, packet.length, &header);
         fprintf(stderr, "Packet len=%zu pt=%u seq=%u ts=%u ssrc=0x%8x\n",
-            packet.length, header.payloadType, header.sequenceNumber,
-            header.timestamp, header.ssrc);
+                packet.length, header.payloadType, header.sequenceNumber,
+                header.timestamp, header.ssrc);
         break;
       }
     }