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Integrates network traversal API to fetch stun and turn servers for
webrtc p2p connection. Handles API failure by returning a list of
public Google stun servers as a fallback.

Bug: 1031156
Change-Id: I60b5d6ccdb749ce9375bcb3333dc2cbdab62aa18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1994295
Commit-Queue: Himanshu Jaju <himanshujaju@chromium.org>
Reviewed-by: Martin Šrámek <msramek@chromium.org>
Reviewed-by: David Roger <droger@chromium.org>
Reviewed-by: Richard Knoll <knollr@chromium.org>
Reviewed-by: Alex Gough <ajgo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#733941}