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This is a reland of d828e2eb

* I added the BUILD dependency to the wrong target in the
  previous reland. It needed to be on generate_schema_org_code.
  https://crrev.com/c/2097359

Original change's description:
> Reland: "Add validator for schema org entities and types in doc metadata mojo."
>
> "
> * Add a validator that removes properties that are not the right type.
> * Add double, time, and timedelta types in the document metadata mojo
>   structure.
> * Use the new mojo types in document metadata extractor.
> "
>
> This is a reland of https://crrev.com/c/2062907 which was reverted in
> https://crrev.com/c/2095670.
>
> The substantial changes are two-fold:
> (1) add build dep on base in schema_org_properties. This should fix the
>     try bot issue which was somehow skipped.
> (2) Rebase on top of https://crrev.com/c/2073337 which was submitted and
>     contains some changes to the mojo structure.
>
> Change-Id: I7f47d74e8833f76d4077028eac0dcb43790a1d26
> Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097059
> Reviewed-by: Daniel Cheng <dcheng@chromium.org>
> Reviewed-by: Becca Hughes <beccahughes@chromium.org>
> Commit-Queue: Sam Bowen <sgbowen@google.com>
> Cr-Commit-Position: refs/heads/master@{#748945}

Change-Id: Ibc7124d5a779d663048315a2697c9c050c1c00c7
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2097452Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Sam Bowen <sgbowen@google.com>
Cr-Commit-Position: refs/heads/master@{#749248}