Whitelist new stats fields in kRTCOutboundRtpStreamStats

Bug: webrtc:9547
Change-Id: If65cddb449e32cfce92bc13bf3db167f148c5bca
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139753
Commit-Queue: Eldar Rello <elrello@microsoft.com>
Commit-Queue: Henrik Boström <hbos@chromium.org>
Reviewed-by: Henrik Boström <hbos@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757196}

chrome/test/data/webrtc/peerconnection_getstats.js

@@ -204,6 +204,12 @@ let kRTCOutboundRtpStreamStats = new RTCStats(kRTCSentRtpStreamStats, {
   pliCount: 'number',
   sliCount: 'number',
   encoderImplementation: 'string',
+  rid: 'string',
+  frameWidth: 'number',
+  frameHeight: 'number',
+  framesPerSecond: 'number',
+  framesSent: 'number',
+  hugeFramesSent: 'number',
 });
 addRTCStatsToWhitelist(
     Presence.MANDATORY, 'outbound-rtp', kRTCOutboundRtpStreamStats);