Whitelist frameBitDepth / bitDepth

frameBitDepth and bitDepth have recently been added to the
WebRTC stats specification.
https://github.com/w3c/webrtc-stats/pull/517

Bug: chromium:1018825
Change-Id: I28ce4361ae7bd70b280564a23913731af7450d4c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1932442
Commit-Queue: Johannes Kron <kron@chromium.org>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719124}

chrome/test/data/webrtc/peerconnection_getstats.js

@@ -117,6 +117,7 @@ let kRTCInboundRtpStreamStats = new RTCStats(kRTCReceivedRtpStreamStats, {
   remoteId: 'string',
   framesDecoded: 'number',
   keyFramesDecoded: 'number',
+  frameBitDepth: 'number',
   qpSum: 'number',
   totalDecodeTime: 'number',
   totalInterFrameDelay: 'number',
@@ -187,6 +188,7 @@ let kRTCOutboundRtpStreamStats = new RTCStats(kRTCSentRtpStreamStats, {
   headerBytesSent: 'number',
   targetBitrate: 'number',
   totalEncodedBytesTarget: 'number',
+  frameBitDepth: 'number',
   framesEncoded: 'number',
   keyFramesEncoded: 'number',
   qpSum: 'number',
@@ -250,6 +252,7 @@ addRTCStatsToWhitelist(
 const kRTCVideoSourceStats = new RTCStats(kRTCMediaSourceStats, {
   width: 'number',
   height: 'number',
+  bitDepth: 'number',
   frames: 'number',
   framesPerSecond: 'number',
 });