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This is an extension for CL https://chromium-review.googlesource.com/c/564903/.
In this patch,
we also replace the switchcase conversion code from CSS enum
to KeywordValue enum.
Gen diff: https://gist.github.com/nguyen-minh-duc/97f5a4942b006690bdc0f442f11dff12/revisions

https: //chromium-review.googlesource.com/c/564903/
Bug: 744203
Change-Id: I11cc3467aaa4911ff948a570d3d076e59114750e
Reviewed-on: https://chromium-review.googlesource.com/572884
Commit-Queue: Minh-Duc Nguyen <nmduc@google.com>
Reviewed-by: meade_UTC10 <meade@chromium.org>
Reviewed-by: Darren Shen <shend@chromium.org>
Reviewed-by: nainar <nainar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#488125}