Apply a fallback for font-size-adjust: ic-height when a required font metric is missing.
The W3C CSS WG resolved font-size-adjust with missing metrics by
applying the same way we do for other missing typographical units [1].
This CL aims to align with the resolution.
[1] w3c/csswg-drafts#6384 (comment)
Bug: 346773386, 325981757
Change-Id: I9dadf89c7e95b249ae149df7d15ccc0f55ea760a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/5637274
Reviewed-by: Dominik Röttsches drott@chromium.org
Commit-Queue: ChangSeok Oh changseok.oh@bytedance.com
Cr-Commit-Position: refs/heads/main@{#1317246}