Enforce policy that SDP munging requires special approval

This ensures that adding features by SDP munging gets a review
by people who understand how this works in the community.

Bug: none
Change-Id: I36feb0e3c7896d4f7bec81078109d7914c349a0d
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/291339
Commit-Queue: Harald Alvestrand <hta@webrtc.org>
Reviewed-by: Henrik Boström <hbos@webrtc.org>
Reviewed-by: Tomas Gunnarsson <tommi@webrtc.org>
Cr-Commit-Position: refs/heads/main@{#39229}
diff --git a/pc/OWNERS b/pc/OWNERS
index 4f82de4..8ceb1f6 100644
--- a/pc/OWNERS
+++ b/pc/OWNERS
@@ -4,3 +4,8 @@
 tommi@webrtc.org
 deadbeef@webrtc.org
 orphis@webrtc.org
+
+# Adding features via SDP munging requires approval from SDP owners
+per-file webrtc_sdp.cc = set noparent
+per-file webrtc_sdp.cc = hta@webrtc.org
+per-file webrtc_sdp.cc = hbos@webrtc.org