Add a list of allowed and disallowed Abseil things

Bug: webrtc:8821
Change-Id: Ifb3bacd3403bbf823c78fff47571a83159f1da73
No-Try: True
Reviewed-on: https://webrtc-review.googlesource.com/95880
Commit-Queue: Mirko Bonadei <mbonadei@webrtc.org>
Reviewed-by: Danil Chapovalov <danilchap@webrtc.org>
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#24437}
diff --git a/OWNERS b/OWNERS
index 587f727..bfa7801 100644
--- a/OWNERS
+++ b/OWNERS
@@ -18,6 +18,9 @@
 per-file THIRD_PARTY_DEPS=phoglund@webrtc.org
 per-file THIRD_PARTY_DEPS=titovartem@webrtc.org
 per-file WATCHLISTS=*
+per-file abseil-in-webrtc.md=danilchap@webrtc.org
+per-file abseil-in-webrtc.md=kwiberg@webrtc.org
+per-file abseil-in-webrtc.md=mbonadei@webrtc.org
 per-file style-guide.md=danilchap@webrtc.org
 per-file style-guide.md=kwiberg@webrtc.org
 per-file native-api.md=kwiberg@webrtc.org