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Currently, CBOR maps only permit keys to be UTF-8 strings. Add support
for unsigned integer keys. Support for negative integer type keys will
be integrated as CL 777807 is lands.

Bug: 786218
Change-Id: Id28864a9c62d0b0d93e71a663b6e8b2b84b2de95
Reviewed-on: https://chromium-review.googlesource.com/781207
Commit-Queue: Jun Choi <hongjunchoi@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Reviewed-by: Balazs Engedy <engedy@chromium.org>
Reviewed-by: Jeffrey Yasskin <jyasskin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#524223}