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This CL also serves as a self-contained "vertical" example for how to
move a WebUI page to the DevUI DFM.

Bug: 927131
Change-Id: I88c5f624d2094ecfd1cf1919d9cb4abe8d1daea4
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1823605Reviewed-by: Tibor Goldschwendt <tiborg@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#700415}