Fix timeout in fast/images/animated-image-mp4-crash.html

[shallawa]

b89b579

Fix timeout in fast/images/animated-image-mp4-crash.html
https://bugs.webkit.org/show_bug.cgi?id=267571
rdar://121035201

Reviewed by Cameron McCormack.

Call "internals.clearMemoryCache()" when initializing the test to reset the
animation state of the image.

* LayoutTests/fast/images/animated-image-mp4-crash.html:

Canonical link: https://commits.webkit.org/273669@main

6a921b9

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash 6a921b9)

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

[heycam]

I don't really understand why this resolves the timeout. Does image.decode() not resolve its promise if the image exists in the MemoryCache and we've tried to (and failed to) decode it before? I wonder if that's actually what the spec wants. Either way, can you please explain a little in a comment here to make it clear why we're doing this.

[shallawa]

Calling internals.clearMemoryCache() resets the animation state of the image. Because the same web process can be used to run the same test multiple times, the image will be cached for later runs. So a run may use the image after the animation has advanced. If the animation ends, the promise will be rejected. And this test expects it to be resolved, so it times out.

[webkit-commit-queue]

Committed 273669@main (b89b579): https://commits.webkit.org/273669@main

Reviewed commits have been landed. Closing PR #22810 and removing active labels.