Add read support of RtpStreamId/RepairedRtpStreamId header extensions.

webrtc/modules/rtp_rtcp/source/rtp_utility.cc

 /*
  *  Copyright (c) 2012 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 451 matching lines @@
           //   +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+
 
           if (ptr[0] <
               static_cast<uint8_t>(VideoContentType::TOTAL_CONTENT_TYPES)) {
             header->extension.hasVideoContentType = true;
             header->extension.videoContentType =
                 static_cast<VideoContentType>(ptr[0]);
           }
           break;
         }
+        case kRtpExtensionRtpStreamId: {
+          header->extension.stream_id.Set(rtc::MakeArrayView(ptr, len + 1));
+          break;
+        }
+        case kRtpExtensionRepairedRtpStreamId: {
+          header->extension.repaired_stream_id.Set(
+              rtc::MakeArrayView(ptr, len + 1));
+          break;
+        }
         case kRtpExtensionNone:
         case kRtpExtensionNumberOfExtensions: {
           RTC_NOTREACHED() << "Invalid extension type: " << type;
           return;
         }
       }
     }
     ptr += (len + 1);
   }
 }
 
 }  // namespace RtpUtility
 }  // namespace webrtc