Distinguish id for GFD and DD rtp header extensions when both are advertised

Bug: webrtc:10342
Change-Id: I021ccad75aff80b67aef550809c6720d13ce2c2b
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/188384
Reviewed-by: Erik Språng <sprang@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#32404}
diff --git a/media/engine/webrtc_video_engine.cc b/media/engine/webrtc_video_engine.cc
index ae1317b..070968d 100644
--- a/media/engine/webrtc_video_engine.cc
+++ b/media/engine/webrtc_video_engine.cc
@@ -629,12 +629,12 @@
         webrtc::RtpExtension::kRidUri, webrtc::RtpExtension::kRepairedRidUri}) {
     result.emplace_back(uri, id++, webrtc::RtpTransceiverDirection::kSendRecv);
   }
-  result.emplace_back(webrtc::RtpExtension::kGenericFrameDescriptorUri00, id,
+  result.emplace_back(webrtc::RtpExtension::kGenericFrameDescriptorUri00, id++,
                       IsEnabled(trials_, "WebRTC-GenericDescriptorAdvertised")
                           ? webrtc::RtpTransceiverDirection::kSendRecv
                           : webrtc::RtpTransceiverDirection::kStopped);
   result.emplace_back(
-      webrtc::RtpExtension::kDependencyDescriptorUri, id,
+      webrtc::RtpExtension::kDependencyDescriptorUri, id++,
       IsEnabled(trials_, "WebRTC-DependencyDescriptorAdvertised")
           ? webrtc::RtpTransceiverDirection::kSendRecv
           : webrtc::RtpTransceiverDirection::kStopped);