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This allows users to view and toggle the Metered property for WiFi and
Cellular networks. (See issue for more details).

Bug: 971704
Change-Id: I6ad441b4781d65875d4d6a44184e9287a789f230
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2216854
Commit-Queue: Steven Bennetts <stevenjb@chromium.org>
Reviewed-by: James Vecore <vecore@google.com>
Reviewed-by: Azeem Arshad <azeemarshad@chromium.org>
Cr-Commit-Position: refs/heads/master@{#772403}