Intent to ship: small/large/dynamic/logical viewport units

[Hiroyuki Ikezoe]

In bug 1610815, I landed the implementation for small/large/dynamic/logical viewport units. It will be available in Firefox 101.

Bug: https://bugzil.la/1610815

Specification: https://drafts.csswg.org/css-values/#viewport-variants

Platform coverage: All, small/large/dynamic units are not particularly useful on desktop environments though 

DevTools bug: None

Other browsers: Both blink and webkit have implemented the new units, I am not sure when it gets available on their release versions

web-platform-tests: There are some primitive tests in https://wpt.fyi/results/css/css-values, there are some in gecko-only tests in DynamicToolbarTest.kt

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hiro