[text-box-trim] Add tests for block-end trimming
This patch adds tests of the block-end trimming, for all
supported variants of text-box-edge and writing-mode.
Bug: 40254880
Change-Id: I35bb604e8367b63121fc7157ea784c95081fcc24
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5553180
Commit-Queue: Kent Tamura tkent@chromium.org
Reviewed-by: Kent Tamura tkent@chromium.org
Auto-Submit: Koji Ishii kojii@chromium.org
Cr-Commit-Position: refs/heads/main@{#1304197}