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No actual WebUI code added yet; this is just the layer that sets
everything up and handles communication.

Bug: 1014639
Change-Id: Ie121d6c02d4d92b84eb24d3412291f93b40de09f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2380670Reviewed-by: dpapad <dpapad@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Commit-Queue: Leonard Grey <lgrey@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807610}