[text-box-trim] Test hit-testing
This patch adds tests for getBoundingClientRect() and
elementFromPoint(), two CSSOM View functions that represent
the logic for hit-testing.
This patch has no behavior changes.
Bug: 40254880
Change-Id: I2d416b042ed278a339daeabfe3c8702b020c458d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5587766
Commit-Queue: Kent Tamura tkent@chromium.org
Auto-Submit: Koji Ishii kojii@chromium.org
Reviewed-by: Kent Tamura tkent@chromium.org
Cr-Commit-Position: refs/heads/main@{#1309621}