webrtc wpt: add addIceCandidate(new RTCIceCandidate({candidate, sdpMid})) test

which should have caught the bug

BUG=965483

Change-Id: I379f14ee625a9f43889d778b9774bb04949c73af
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1628722
Reviewed-by: Guido Urdaneta <guidou@chromium.org>
Commit-Queue: Philipp Hancke <philipp.hancke@googlemail.com>
Cr-Commit-Position: refs/heads/master@{#663512}
2 files changed