Plumb corruption metric to rtc_stats_report.cc and add wpt tests.
See https://www.w3.org/TR/webrtc-stats/#dom-rtcinboundrtpstreamstats-totalcorruptionprobability for more details and why the tests were constructed as they are.
Bug: chromium:378726501
Change-Id: I6a85df5a5d5610b889f023ceffc596f39b8f9537
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/6012441
Commit-Queue: Henrik Boström hbos@chromium.org
Reviewed-by: Henrik Boström hbos@chromium.org
Reviewed-by: Guido Urdaneta guidou@chromium.org
Cr-Commit-Position: refs/heads/main@{#1382908}