Adding some AV1 constants and helper functions

I've added a basic AV1 impl to Chrome Remote Desktop and am looking into
what is needed to test with I444 (Profile-1) in our platform. This CL
adds a few helper functions, constants, and enums that can be used to
configure the SDP with different AV1 profiles. More work is still needed
but I wanted to get this in place first so I can build on it in the CRD
host code.

Change-Id: I1af9ebf31f833138e8c36e0c0a30e32289e7b58e
Bug: chromium:1329660
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/264000
Reviewed-by: Rasmus Brandt <brandtr@webrtc.org>
Reviewed-by: Niels Moller <nisse@webrtc.org>
Commit-Queue: Joe Downing <joedow@google.com>
Cr-Commit-Position: refs/heads/main@{#37182}

api/video_codecs/sdp_video_format.cc

@@ -11,6 +11,7 @@
 #include "api/video_codecs/sdp_video_format.h"
 
 #include "absl/strings/match.h"
+#include "api/video_codecs/av1_profile.h"
 #include "api/video_codecs/h264_profile_level_id.h"
 #include "api/video_codecs/video_codec.h"
 #include "api/video_codecs/vp9_profile.h"
@@ -55,6 +56,8 @@ bool IsSameCodecSpecific(const SdpVideoFormat& format1,
                                          format2.parameters);
     case kVideoCodecVP9:
       return VP9IsSameProfile(format1.parameters, format2.parameters);
+    case kVideoCodecAV1:
+      return AV1IsSameProfile(format1.parameters, format2.parameters);
     default:
       return true;
   }