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Add logging tab and support to send logs created with PA_LOG macro to
chrome://multidevice-internals page for display. Logs color coded by
severity and displayed with timestamp and log file. Screenshot of
display here:
https://screenshot.googleplex.com/bc0d994b-4f58-4793-84f8-144a150f1496

Change-Id: Ic68aad70c400c5bdc55f7fa37fb20c36c4669233
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2366654
Commit-Queue: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Kyle Horimoto <khorimoto@chromium.org>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Josh Nohle <nohle@chromium.org>
Cr-Commit-Position: refs/heads/master@{#800787}