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[ScrollUnification] Parameterize LTHI tests

This ensures scroll-related unit tests in this file run with both
unification enabled and disabled.

Bug: 1086625
Change-Id: Ic64d466ff8b93bb208aa676be4c1188d58964186
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2222141
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: Xida Chen <xidachen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#774032}