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Design doc: https://bit.ly/39qATQ4

This patch adds a new @font-face descriptor to override spacing between
characters when the font is used.

For simplicity, this patch only implements the parsing of the
descriptor, but doesn't affect any rendering. A follow up patch
(crrev.com/c/2318510) will apply it in text shaping.

Note: Though we don't have a stable spec at the moment, we land
it behind a flag to make testing and discussion easier.

Bug: 1098355
Change-Id: I7921aad0d03e0b7da0c2fca77c99324ab7449e2b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2335823Reviewed-by: Dominik Röttsches <drott@chromium.org>
Reviewed-by: Chris Harrelson <chrishtr@chromium.org>
Reviewed-by: Rune Lillesveen <futhark@chromium.org>
Commit-Queue: Xiaocheng Hu <xiaochengh@chromium.org>
Cr-Commit-Position: refs/heads/master@{#794696}