Wire up transport sequence number / send time callbacks to webrtc via libjingle.

talk/media/base/constants.h

Index: talk/media/base/constants.h
diff --git a/talk/media/base/constants.h b/talk/media/base/constants.h
index d92cb22514c15659979d356bc1b2699549f8abc4..3e1689cb24c0873fb2634e74a614fdd9a06bd1aa 100644
--- a/talk/media/base/constants.h
+++ b/talk/media/base/constants.h
@@ -107,6 +107,9 @@ extern const char kRtcpFbNackParamPli[];
 // rtcp-fb messages according to
 // http://tools.ietf.org/html/draft-alvestrand-rmcat-remb-00
 extern const char kRtcpFbParamRemb[];
+// and according to

[pthatcher1, 2015/09/25 23:24:57]

This won't make sense if we remove the comments above :).   Maybe just keep it
as

// rtcp-fb message according to

[stefan-webrtc, 2015/10/02 13:29:12]

Done.

+// http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions
+extern const char kRtcpFbParamTransport[];
 // ccm submessages according to RFC 5104
 extern const char kRtcpFbParamCcm[];
 extern const char kRtcpFbCcmParamFir[];
@@ -154,6 +157,11 @@ extern const char kRtpVideoRotationHeaderExtension[];
 // We don't support 6 bit CVO. Added here for testing purpose.
 extern const char kRtpVideoRotation6BitsHeaderExtensionForTesting[];
 
+// Header extension for transport sequence number, see url for details:
+// http://www.ietf.org/id/draft-holmer-rmcat-transport-wide-cc-extensions
+extern const int kRtpTransportSequenceNumberHeaderExtensionDefaultId;
+extern const char kRtpTransportSequenceNumberHeaderExtension[];
+
 extern const int kNumDefaultUnsignalledVideoRecvStreams;
 
 extern const char kVp8CodecName[];