Add read support of RtpStreamId/RepairedRtpStreamId header extensions.

webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc

Index: webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc
diff --git a/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc b/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc
index 1b311e64190cd80eb146ddba3628ac67a503d30d..7b8190f12b8dcdd4ef5f50af2f5e5edf7aac343a 100644
--- a/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc
+++ b/webrtc/modules/rtp_rtcp/source/rtp_header_extensions.cc
@@ -215,4 +215,29 @@ bool PlayoutDelayLimits::Write(uint8_t* data,
   return true;
 }
 
+// RtpStreamId.
+constexpr RTPExtensionType RtpStreamId::kId;
+constexpr uint8_t RtpStreamId::kValueSizeBytes;
+constexpr const char* RtpStreamId::kUri;
+
+bool RtpStreamId::Parse(rtc::ArrayView<const uint8_t> data, std::string* rsid) {
+  if (data.empty())
+    return false;
+  rsid->assign(reinterpret_cast<const char*>(data.data()), data.size());
+  return true;
+}
+
+// RepairedRtpStreamId.
+constexpr RTPExtensionType RepairedRtpStreamId::kId;
+constexpr uint8_t RepairedRtpStreamId::kValueSizeBytes;
+constexpr const char* RepairedRtpStreamId::kUri;
+
+bool RepairedRtpStreamId::Parse(rtc::ArrayView<const uint8_t> data,
+                                std::string* rsid) {
+  if (data.empty())
+    return false;
+  rsid->assign(reinterpret_cast<const char*>(data.data()), data.size());
+  return true;
+}
+
 }  // namespace webrtc