Switch to alternate <source> element for AirPlay when necessary

[eric-carlson]

662a2f3918e0096b869ec62ada964c08e0a0c222

Switch to alternate <source> element for AirPlay when necessary
https://bugs.webkit.org/show_bug.cgi?id=246466
<rdar://101136233>

Reviewed by NOBODY (OOPS!).

* LayoutTests/media/media-source/remoteplayback-from-source-element-expected.txt: Added.
* LayoutTests/media/media-source/remoteplayback-from-source-element.html: Added.

* Source/WebCore/Modules/remoteplayback/RemotePlayback.cpp:
(WebCore::RemotePlayback::watchAvailability): Add runtime logging.
(WebCore::RemotePlayback::cancelWatchAvailability): Ditto.
(WebCore::RemotePlayback::prompt): Ditto.
(WebCore::RemotePlayback::shouldPlayToRemoteTargetChanged): Ditto.
(WebCore::RemotePlayback::setState): Ditto.
(WebCore::RemotePlayback::disconnect): Ditto.
(WebCore::RemotePlayback::availabilityChanged): Ditto.
(WebCore::RemotePlayback::setLogger):  Ditto.
(WebCore::RemotePlayback::logChannel const): Ditto.
* Source/WebCore/Modules/remoteplayback/RemotePlayback.h:

* Source/WebCore/html/HTMLMediaElement.cpp:
(WebCore::HTMLMediaElement::HTMLMediaElement): Set remote logger.
(WebCore::HTMLMediaElement::checkPlaybackTargetCompatibility): If loaded from a <source>
element and is another <source> uses a media engine that supports remote playback, try
loading that.
(WebCore::HTMLMediaElement::loadResource): Don't bother trying MSE, MediaStream, or blob
if the load requires remote playback.
(WebCore::HTMLMediaElement::applyConfiguration): Apply the stored configuration.
(WebCore::HTMLMediaElement::setReadyState): Apply the remote configuration once
HAVE_FUTURE_DATA is reached.
(WebCore::HTMLMediaElement::selectNextSourceChild): Set parameter `requiresRemotePlayback`
field.
(WebCore::HTMLMediaElement::clearMediaPlayer): Force a target availability event.
(WebCore::HTMLMediaElement::wirelessRoutesAvailableDidChange): Only post availability event
when availability actually changes.
(WebCore::HTMLMediaElement::setIsPlayingToWirelessTarget):
(WebCore::HTMLMediaElement::enqueuePlaybackTargetAvailabilityChangedEvent): Add parameter
so we don't necessarily post events when availability doesn't change.
(WebCore::HTMLMediaElement::addEventListener): Force a target availability event.
* Source/WebCore/html/HTMLMediaElement.h:

* Source/WebCore/html/MediaElementSession.cpp:
(WebCore::MediaElementSession::showPlaybackTargetPicker): Always log.

* Source/WebCore/platform/graphics/MediaPlayer.cpp:
(WebCore::MediaPlayer::load): Add `requiresRemotePlayback` parameter.
* Source/WebCore/platform/graphics/MediaPlayer.h:
(WebCore::MediaEngineSupportParameters::encode const):
(WebCore::MediaEngineSupportParameters::decode):

* Source/WebCore/platform/graphics/avfoundation/objc/MediaPlayerPrivateMediaStreamAVFObjC.mm:
(WebCore::MediaPlayerPrivateMediaStreamAVFObjC::supportsType): Consider new support field.

* Source/WebCore/platform/graphics/cocoa/MediaPlayerPrivateWebM.mm:
(WebCore::MediaPlayerPrivateWebM::supportsType): Ditto.

* Source/WebCore/testing/Internals.cpp:
(WebCore::Internals::setMockMediaPlaybackTargetPickerEnabled): NULL-check frame and page.
(WebCore::Internals::setMockMediaPlaybackTargetPickerState): Ditto.
(WebCore::Internals::mockMediaPlaybackTargetPickerDismissPopup): Ditto.

* Source/WebKit/GPUProcess/media/RemoteMediaPlayerProxy.cpp:
(WebKit::RemoteMediaPlayerProxy::load): Add "requires remote playback" parameter.
* Source/WebKit/GPUProcess/media/RemoteMediaPlayerProxy.h:
* Source/WebKit/GPUProcess/media/RemoteMediaPlayerProxy.messages.in: Ditto.

* Source/WebKit/WebProcess/GPU/media/MediaPlayerPrivateRemote.cpp:
(WebKit::MediaPlayerPrivateRemote::load): Ditto.

* Source/WebKit/WebProcess/GPU/media/RemoteMediaPlayerMIMETypeCache.cpp:
(WebKit::RemoteMediaPlayerMIMETypeCache::supportsTypeAndCodecs): Ditto.
* Source/WebKit/WebProcess/GPU/media/RemoteMediaPlayerMIMETypeCache.h:

https://github.com/WebKit/WebKit/commit/4870c571f3585509f79e00acf1655f10dd01c2ad

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/662a2f3918e0096b869ec62ada964c08e0a0c222)

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

[webkit-early-warning-system]

EWS run on previous version of this PR (hash https://github.com/WebKit/WebKit/commit/2f9aeabf19858e5be88fdc087042fdc4f1815981)

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

[webkit-early-warning-system]

EWS run on current version of this PR (hash https://github.com/WebKit/WebKit/commit/4870c571f3585509f79e00acf1655f10dd01c2ad)

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

[webkit-commit-queue]

Committed 255624@main (4ec10f6ab820): https://commits.webkit.org/255624@main

Reviewed commits have been landed. Closing PR #5380 and removing active labels.