Use generateThreadSafe for RenderingResourceIdentifier.

[mattwoodrow]

3050026

Use generateThreadSafe for RenderingResourceIdentifier.
https://bugs.webkit.org/show_bug.cgi?id=254796
<rdar://105752952>

Reviewed by Simon Fraser.

We can allocate ImageBuffers from a worker thread, so we need to use the thread safe allocator
for all RenderingResourceIdentifiers.

* Source/WebCore/platform/graphics/DecomposedGlyphs.h:
* Source/WebCore/platform/graphics/Font.cpp:
(WebCore::Font::renderingResourceIdentifier const):
* Source/WebCore/platform/graphics/ImageBuffer.h:
* Source/WebCore/platform/graphics/NativeImage.h:
* Source/WebKit/WebProcess/GPU/graphics/RemoteImageBufferProxy.h:
* Tools/TestWebKitAPI/Tests/WebCore/cg/DisplayListTestsCG.cpp:
(TestWebKitAPI::TEST):

Canonical link: https://commits.webkit.org/262486@main

bcfb7b6

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
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	🧪 gtk-wk2
	✅ 🛠 tv	✅ 🧪 mac-wk2	🧪 api-gtk
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
✅ 🛠 🧪 merge	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash 701ff01)

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
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	✅ 🧪 gtk-wk2
	✅ 🛠 tv	✅ 🧪 mac-wk2	❌ 🧪 api-gtk
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
	✅ 🛠 watch-sim

[smfr]

We allocate rendering resources from multiple threads, so we need to use the thread safe allocator.

Would be nice to give an example of an off-main-thread call site. Offscreen canvas only, or something else?

[webkit-early-warning-system]

EWS run on current version of this PR (hash bcfb7b6)

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
	✅ 🧪 api-ios	✅ 🧪 mac-wk1	🧪 gtk-wk2
	✅ 🛠 tv	✅ 🧪 mac-wk2	🧪 api-gtk
	✅ 🛠 tv-sim	✅ 🧪 mac-AS-debug-wk2
	✅ 🛠 watch	✅ 🧪 mac-wk2-stress
✅ 🛠 🧪 merge	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 262486@main (3050026): https://commits.webkit.org/262486@main

Reviewed commits have been landed. Closing PR #12226 and removing active labels.