WebCore::colorFromCocoaColor can sometimes fail to convert a color

[rr-codes]

d4bad90

`WebCore::colorFromCocoaColor` can sometimes fail to convert a color
https://bugs.webkit.org/show_bug.cgi?id=257405
rdar://108643609

Reviewed by Aditya Keerthi.

The method `[UIColor getRed:green:blue:alpha:]` can fail if the given color is of an incompatible
color space, such as `NSColor Generic Gray Gamma 2.2 Profile colorspace 0.5 1`. Previously in the
ColorIOS implementation of `WebCore::colorFromCocoaColor`, we would just silently fail and return
an empty color.

This PR fixes this by checking if `[UIColor getRed:green:blue:alpha:]` is successful. If it is not,
we instead create a single colored pixel, and then extract the converted color from it to return.

* Source/WebCore/platform/ios/ColorIOS.mm:
(WebCore::colorFromCocoaColor):

Canonical link: https://commits.webkit.org/264619@main

29bcfd6

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

[pxlcoder]

In Catalyst,

Remember that this is not just about Catalyst, the method can also return NO on iOS.

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 1e6c73b)

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
⏳ 🧪 services	⏳ 🛠 tv-sim
	⏳ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash 29bcfd6)

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 264619@main (d4bad90): https://commits.webkit.org/264619@main

Reviewed commits have been landed. Closing PR #14414 and removing active labels.