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Add a tab that will eventually display Nearby-related HTTP messages. See
the following screenshot for display:
https://screenshot.googleplex.com/mL7965ihWuh.

Bug: 1093634
Change-Id: I7d0cb3a15f6f114a888ff86ab0545f645ae5b9c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2269700Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Commit-Queue: Juliet Levesque <julietlevesque@google.com>
Cr-Commit-Position: refs/heads/master@{#788766}