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"
* 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/+/2097059Reviewed-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}