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This page is a Mojo-based WebUI page, and it supports the following
operations:
* Read key/value properties of the system, currently flag state,
  country code, and server endpoint.
* Clear the catalog database.
* Override the request country.
* Force a network request.

Bug: 900673
Change-Id: Iafff7c0b66f37a93bd46e7251ba231823951a513
Reviewed-on: https://chromium-review.googlesource.com/c/1310757Reviewed-by: Demetrios Papadopoulos <dpapad@chromium.org>
Reviewed-by: Ken Rockot <rockot@google.com>
Reviewed-by: Greg Kerr <kerrnel@chromium.org>
Reviewed-by: Cathy Li <chili@chromium.org>
Reviewed-by: Peter Williamson <petewil@chromium.org>
Commit-Queue: Justin DeWitt <dewittj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636819}