[iOS] Camera track is sometimes muted/unmuted when starting to capture

[youennf]

05c0e82b2712e5fec50610c7ddaa8798b4688975

[iOS] Camera track is sometimes muted/unmuted when starting to capture
https://bugs.webkit.org/show_bug.cgi?id=274211
rdar://125475254

Reviewed by NOBODY (OOPS!).

There is a race condition below WebKit between media endowment activation and camera start-u.
This sometimes triggers spurious notification of being muted on iOS.
We add a timer that will delay mute notifications at startup time for 1 second.

WIP, needs more testing.

* Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.h:
* Source/WebCore/platform/mediastream/mac/AVVideoCaptureSource.mm:
(WebCore::AVVideoCaptureSource::AVVideoCaptureSource):
(WebCore::AVVideoCaptureSource::startupTimerFired):
(WebCore::AVVideoCaptureSource::startProducingData):
(WebCore::AVVideoCaptureSource::captureSessionIsRunningDidChange):

https://github.com/WebKit/WebKit/commit/05c0e82b2712e5fec50610c7ddaa8798b4688975

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	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	⏳ 🛠 wpe-skia
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/05c0e82b2712e5fec50610c7ddaa8798b4688975)

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	✅ 🧪 api-wpe
	✅ 🧪 ios-wk2-wpt	✅ 🧪 mac-wk1	⏳ 🛠 wpe-skia
	✅ 🧪 api-ios	✅ 🧪 mac-wk2	✅ 🛠 gtk
	✅ 🛠 tv	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 tv-sim	✅ 🧪 mac-wk2-stress	✅ 🧪 api-gtk
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on current version of this PR (hash https://github.com/WebKit/WebKit/commit/487705fc95ade9997d88320f043a92f5b7da7c42)

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

[webkit-commit-queue]

Committed 278952@main (da808677339d): https://commits.webkit.org/278952@main

Reviewed commits have been landed. Closing PR #28593 and removing active labels.