Disable the background responsiveness timer when RunningBoard is used

[cdumez]

4224c4b

Disable the background responsiveness timer when RunningBoard is used
https://bugs.webkit.org/show_bug.cgi?id=258534

Reviewed by Ben Nham.

Disable the background responsiveness timer when RunningBoard is used. We used
to only disable it on iOS because we only used RunningBoard on iOS. However,
now that we use RunningBoard on macOS too, we should disable it on this
platform too. Background processes now get a very low priority and eventually
get suspended. This would cause false reports of unresponsive processes.

* Source/WebKit/UIProcess/BackgroundProcessResponsivenessTimer.cpp:
(WebKit::BackgroundProcessResponsivenessTimer::shouldBeActive const):

Canonical link: https://commits.webkit.org/265536@main

7c85ff1

Misc	iOS, tvOS & watchOS	macOS	Linux	Windows
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 wincairo
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🛠 gtk
	✅ 🧪 ios-wk2-wpt		✅ 🧪 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 current version of this PR (hash 7c85ff1)

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

[bnham]

LGTM

[webkit-commit-queue]

Committed 265536@main (4224c4b): https://commits.webkit.org/265536@main

Reviewed commits have been landed. Closing PR #15306 and removing active labels.