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This will be used to validate that property data is the right type as
described by the schema. This amends an existing script that will use a
json+ld file checked into third_party.

Bug: 1044250
Change-Id: I781f4f50a0331655e36a03b7fc26d9c54c0ae87c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2036892Reviewed-by: Becca Hughes <beccahughes@chromium.org>
Commit-Queue: Sam Bowen <sgbowen@google.com>
Cr-Commit-Position: refs/heads/master@{#738644}