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There was a Mozilla test failing in Chromium
because of "will-change: contain" is not creating a stacking context.

This has been clarified in the following CSSWG issue:
https://github.com/w3c/csswg-drafts/issues/4612

The fix is just adding the "contain" property
to HasPropertyThatCreatesStackingContext() in computed_style.cc.

BUG=881057
TEST=css/vendor-imports/mozilla/mozilla-central-reftests/contain/contain-paint-stacking-context-001b.html

Change-Id: I52a50cfac7bc46a74557760006dc46abba0632ba
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1975913Reviewed-by: Oriol Brufau <obrufau@igalia.com>
Reviewed-by: Eric Willigers <ericwilligers@chromium.org>
Commit-Queue: Eric Willigers <ericwilligers@chromium.org>
Cr-Commit-Position: refs/heads/master@{#726569}