[CSS Fonts] font-size-adjust adopts ValueType and isNone().

[shivamidow]

cfb2009

[CSS Fonts] font-size-adjust adopts ValueType and isNone().
https://bugs.webkit.org/show_bug.cgi?id=262882

Reviewed by Tim Nguyen.

To improve code readability, this change replaces a boolean with an enum class,
which represents the from-font value type of FontSizeAdjust. In addition, this
patch changes the boolean operator of FontSizeAdjust to an explicit method name
called isNone() as a follow-up of 269041@main [1].

[1] https://commits.webkit.org/269041@main

* Source/WebCore/animation/CSSPropertyAnimation.cpp:
* Source/WebCore/css/ComputedStyleExtractor.cpp:
(WebCore::fontSizeAdjustFromStyle):
(WebCore::fontShorthandValue):
* Source/WebCore/platform/graphics/FontCascadeCache.h:
(WebCore::FontDescriptionKey::FontDescriptionKey):
* Source/WebCore/platform/graphics/FontCascadeFonts.h:
(WebCore::FontCascadeFonts::primaryFont):
* Source/WebCore/platform/graphics/FontSizeAdjust.h:
(WebCore::FontSizeAdjust::isNone const):
(WebCore::FontSizeAdjust::isFromFont const):
(WebCore::add):
(WebCore::operator<<):
(WebCore::FontSizeAdjust::operator bool const): Deleted.
* Source/WebCore/style/StyleBuilderConverter.h:
(WebCore::Style::BuilderConverter::convertFontSizeAdjust):

Canonical link: https://commits.webkit.org/269124@main

b268180

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash a2cbbc7)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash d7d675d)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	⏳ 🛠 ios	🛠 mac	❌ 🛠 wpe	⏳ 🛠 wincairo
✅ 🧪 bindings	⏳ 🛠 ios-sim	⏳ 🛠 mac-AS-debug	❌ 🧪 wpe-wk2
✅ 🧪 webkitperl	⏳ 🧪 ios-wk2	🧪 api-mac	🛠 gtk
	⏳ 🧪 ios-wk2-wpt	🧪 mac-wk1	🧪 gtk-wk2
⏳ 🛠 🧪 jsc	⏳ 🧪 api-ios	🧪 mac-wk2	🧪 api-gtk
⏳ 🛠 🧪 jsc-arm64	⏳ 🛠 tv	⏳ 🧪 mac-AS-debug-wk2
	⏳ 🛠 tv-sim	🧪 mac-wk2-stress
	⏳ 🛠 watch
	⏳ 🛠 watch-sim

[shivamidow]

A merge-conflict fixed since 269084@main

[webkit-early-warning-system]

EWS run on current version of this PR (hash b268180)

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
✅ 🧪 bindings	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🧪 api-gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 tv-sim
✅ 🛠 🧪 merge	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 269124@main (cfb2009): https://commits.webkit.org/269124@main

Reviewed commits have been landed. Closing PR #18833 and removing active labels.