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This adds some more logging when WebRTC raises a selected-candidate-pair
changed event.

Bug: 1128667
Change-Id: I5629885233b2cd201d2f7b80ff1f78bd6b3803f9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2477476
Auto-Submit: Lambros Lambrou <lambroslambrou@chromium.org>
Commit-Queue: Jamie Walch <jamiewalch@chromium.org>
Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Cr-Commit-Position: refs/heads/master@{#817748}