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This documents the cool stuff hiding in Dev UI's options menu. This also
links to instructions for hooking up WebView to Chrome DevTools, in case
folks find this page looking for that.

Bug: 1058571
Test: tools/md_browser/md_browser.py
Test: Upload to gerrit > open file > click "gitiles"
Change-Id: I6ecd5ac4b8e102b36a5cbdd28c9ce60958057a99
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2144263
Commit-Queue: Richard Coles <torne@chromium.org>
Auto-Submit: Nate Fischer <ntfschr@chromium.org>
Reviewed-by: Richard Coles <torne@chromium.org>
Cr-Commit-Position: refs/heads/master@{#758203}