706e306

[css-values-4] logical `*vi`(inline) and `*vb` (block) viewport units should be based on the current element's `writing-mode`
https://bugs.webkit.org/show_bug.cgi?id=234373
<rdar://problem/86832561 >

Reviewed by Tim Nguyen.

Previously, we only looked at the root element's `writing-mode`. Looking at the current element's
`writing-mode` allows for non-root elements to have a `writing-mode` independent of the root element,
as well as having styles based on that. This was changed in <w3c/csswg-drafts#6873 >.

Tests: CSSViewportUnits.AllSame
       CSSViewportUnits.MinimumViewportInsetWithWritingMode
       CSSViewportUnits.MaximumViewportInsetWithWritingMode
       CSSViewportUnits.EmptyUnobscuredSizeOverrides
       CSSViewportUnits.SameUnobscuredSizeOverrides
       CSSViewportUnits.DifferentUnobscuredSizeOverrides
       CSSViewportUnits.SVGDocument

* Source/WebCore/css/CSSPrimitiveValue.cpp:
(WebCore::lengthOfViewportPhysicalAxisForLogicalAxis):
(WebCore::CSSPrimitiveValue::computeNonCalcLengthDouble):

* Tools/TestWebKitAPI/Tests/WebKitCocoa/CSSViewportUnits.mm:
(changeCSSPropertyOfElements): Added.
(TEST.CSSViewportUnits.AllSame):
(TEST.CSSViewportUnits.MinimumViewportInsetWithWritingMode):
(TEST.CSSViewportUnits.MaximumViewportInsetWithWritingMode):
(TEST.CSSViewportUnits.EmptyUnobscuredSizeOverrides):
(TEST.CSSViewportUnits.SameUnobscuredSizeOverrides):
(TEST.CSSViewportUnits.DifferentUnobscuredSizeOverrides):
(TEST.CSSViewportUnits.SVGDocument):

Canonical link: https://commits.webkit.org/250835@main
git-svn-id: https://svn.webkit.org/repository/webkit/trunk@294609 268f45cc-cd09-0410-ab3c-d52691b4dbfc