Bug 1854743 [wpt PR 42115] - [text-spacing-trim] Support fonts with `chws`, a=testonly

Bug 1854743 [wpt PR 42115] - [text-spacing-trim] Support fonts with `chws`, a=testonly

Automatic update from web-platform-tests
[text-spacing-trim] Support fonts with `chws`

This patch changes the `EastAsianSpacing` logic to support
fonts with `chws`, along with a test with a test font that
has `chws`.

When the font has `chws`, it can handle character sequences
automatically, similar to kerning. All what the rendering
engine must do is at the run edges, where OpenType features
can't handle.

Not only necessary, applying `halt` on top of `chws` kerns
twice, causing glyph collisions. This patch fixes it.

The test is the same as `text-spacing-trim-001.html` except
it uses the font with `chws`. This can probably be done by the
wpt variants[1], but it doesn't work as expected with Chromium
bots. This is being investigated separately[2].

[1] https://wpt-docs.readthedocs.io/en/latest/_writing-tests/testharness.html#variants
[2] crbug.com/1485860

Bug: 1463891
Change-Id: Ia8d8fd260135b43cdcd3b266ca1de038d22809b2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/4881743
Commit-Queue: Koji Ishii <kojii@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Cr-Commit-Position: refs/heads/main@{#1200102}

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wpt-commits: 9fed32c6cef0022c32812e67c59ee399237f3ecb
wpt-pr: 42115