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The lifted function is similar to the ExpandRangeToWordBoundary(...).
It allows to get the enclosing range at grapheme boundaries.

R=pkasting@chromium.org

Bug: 1025561
Change-Id: I4f439b81ac0c1c7e540f67b98c9e3e7f9757b36b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1982714
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Reviewed-by: Peter Kasting <pkasting@chromium.org>
Cr-Commit-Position: refs/heads/master@{#727676}