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Add a tab that will eventually display Nearby-related logging. See
the following screenshot for display:
https://screenshot.googleplex.com/rWNCYHoapn3.

Bug: 1093634
Change-Id: I61b291c20e3563c88a64e398b4320403496f7e18
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2246557
Commit-Queue: Juliet Levesque <julietlevesque@google.com>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#783039}