Add methods for creating boolean simple values

Add helper methods and static factory methods for creating/accessing
boolean CBOR simple values.

Bug: 803648
Change-Id: If0297d149ee1b58022fcf6b92e521b28e5f9faff
Reviewed-on: https://chromium-review.googlesource.com/875196
Commit-Queue: Jun Choi <[email protected]>
Reviewed-by: Balazs Engedy <[email protected]>
Reviewed-by: Jan Wilken Dörrie <[email protected]>
Reviewed-by: Kim Paulhamus <[email protected]>
Cr-Commit-Position: refs/heads/master@{#530958}
3 files changed