[iOS] Propagate visibility during fullscreen video layer hosting

[aestes]

23a2f28

[iOS] Propagate visibility during fullscreen video layer hosting
https://bugs.webkit.org/show_bug.cgi?id=316184
rdar://175469152

Reviewed by Jer Noble.

When WebKit's fullscreen video layer is hosted in another process, the UI process and
auxiliary processes should be considered visible for the duration of the fullscreen
presentation. The existing mechanism for visibility propagation (WKVisibilityPropagationView)
relies on the web view being in a visible scene, and while the app hosting the video layer does
propagate a visibility endowment to the UI process, WKVisibilityPropagationView does not further
propagate visibility to the auxiliary processes if the web view itself is not visible.

To address this, introduced LayerHostingVisibilityPropagator. It propagates a hereditary visibility
endowment grant to each auxiliary process for every visibility endowment granted to the UI process.
It also takes a MediaPlayback process assertion on the UI process for the duration of the fullscreen
layer presentation (to account for the lack of a visible scene assertion).

To detect which source environments currently hold the endowment, EndowmentStateTracker now
requests RBSProcessStateValueEndowmentInfos and walks RBSProcessEndowmentInfo entries instead of
just namespaces, allowing it to record the source environment per visibility grant and notify
clients via a new visibilityEndowmentEnvironmentsChanged() callback.

VideoPresentationManagerProxy creates a propagator during fullscreen setup, attaches it to the
VideoPresentationModel, and removes it during cleanup. WKContentView keeps a WeakHashSet of active
propagators and updates them alongside the existing WKVisibilityPropagationViews as auxiliary
processes launch and exit.

* Source/WebKit/Platform/spi/ios/BaseBoardSPI.h:
* Source/WebKit/Platform/spi/ios/RunningBoardServicesSPI.h:
(+[RBSProcessPredicate predicateMatchingHandle:]):
* Source/WebKit/SourcesCocoa.txt:
* Source/WebKit/UIProcess/Cocoa/VideoPresentationManagerProxy.h:
* Source/WebKit/UIProcess/Cocoa/VideoPresentationManagerProxy.mm:
(WebKit::VideoPresentationModelContext::setLayerHostingVisibilityPropagator):
(WebKit::VideoPresentationManagerProxy::setupFullscreenWithID):
(WebKit::VideoPresentationManagerProxy::didCleanupFullscreen):
* Source/WebKit/UIProcess/EndowmentStateTracker.h:
(WebKit::EndowmentStateTrackerClient::visibilityEndowmentEnvironmentsChanged):
(WebKit::EndowmentStateTracker::visibilityEndowmentEnvironments const):
* Source/WebKit/UIProcess/EndowmentStateTracker.mm:
(WebKit::handleForPID):
(WebKit::EndowmentStateTracker::stateFromProcessState):
(WebKit::EndowmentStateTracker::isApplicationForeground):
(WebKit::EndowmentStateTracker::stateForHandle):
(WebKit::EndowmentStateTracker::registerMonitorIfNecessary):
(WebKit::EndowmentStateTracker::ensureState const const):
(WebKit::EndowmentStateTracker::setState):
(): Deleted.
(WebKit::EndowmentStateTracker::stateFromEndowments): Deleted.
* Source/WebKit/UIProcess/PageClient.h:
(WebKit::PageClient::createLayerHostingVisibilityPropagator):
* Source/WebKit/UIProcess/ios/LayerHostingVisibilityPropagator.h: Added.
* Source/WebKit/UIProcess/ios/LayerHostingVisibilityPropagator.mm: Added.
(WebKit::invalidateInjectors):
(WebKit::LayerHostingVisibilityPropagator::create):
(WebKit::LayerHostingVisibilityPropagator::LayerHostingVisibilityPropagator):
(WebKit::LayerHostingVisibilityPropagator::~LayerHostingVisibilityPropagator):
(WebKit::LayerHostingVisibilityPropagator::propagateVisibilityToProcess):
(WebKit::LayerHostingVisibilityPropagator::stopPropagatingVisibilityToProcess):
(WebKit::LayerHostingVisibilityPropagator::clear):
(WebKit::LayerHostingVisibilityPropagator::visibilityEndowmentEnvironmentsChanged):
(WebKit::LayerHostingVisibilityPropagator::refreshInjectorsAtIndex):
* Source/WebKit/UIProcess/ios/PageClientImplIOS.h:
* Source/WebKit/UIProcess/ios/PageClientImplIOS.mm:
(WebKit::PageClientImpl::createLayerHostingVisibilityPropagator):
* Source/WebKit/UIProcess/ios/WKContentView.h:
* Source/WebKit/UIProcess/ios/WKContentView.mm:
(-[WKContentView _setupVisibilityPropagationForWebProcess:contextID:]):
(-[WKContentView _removeVisibilityPropagationForWebProcess:]):
(-[WKContentView _setupVisibilityPropagationForGPUProcess]):
(-[WKContentView _setupVisibilityPropagationForModelProcess]):
(-[WKContentView _removeVisibilityPropagationViewForGPUProcess]):
(-[WKContentView _removeVisibilityPropagationViewForModelProcess]):
(-[WKContentView _resetVisibilityPropagation]):
(-[WKContentView _createLayerHostingVisibilityPropagator]):
* Source/WebKit/WebKit.xcodeproj/project.pbxproj:

Canonical link: https://commits.webkit.org/314516@main

6895f50

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	❌ 🛠 ios-apple
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	🧪 win-tests	❌ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		❌ 🛠 vision-apple
	🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios		✅ 🛠 gtk
	✅ 🛠 ios-safer-cpp	✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim	✅ 🧪 mac-site-isolation
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-early-warning-system]

EWS run on previous version of this PR (hash ec7b139)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	❌ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	⏳ 🛠 ios-apple
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	🧪 win-tests	⏳ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		⏳ 🛠 vision-apple
	✅ 🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios		✅ 🛠 gtk
	❌ 🛠 ios-safer-cpp	✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim	✅ 🧪 mac-site-isolation
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-ews-buildbot]

iOS Safer C++ Build #30645 (ec7b139)

❌ Found 1 failing file with 3 issues. Please address these issues before landing. See WebKit Guidelines for Safer C++ Programming.
(cc @rniwa)

[webkit-early-warning-system]

EWS run on previous version of this PR (hash eea23f3)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	❌ 🛠 ios-apple
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	🧪 win-tests	❌ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		✅ 🛠 vision-apple
	🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios		✅ 🛠 gtk
	❌ 🛠 ios-safer-cpp	✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim	✅ 🧪 mac-site-isolation
	✅ 🛠 watch
	✅ 🛠 watch-sim

[jernoble]

r=me with nits

[webkit-ews-buildbot]

iOS Safer C++ Build #30751 (eea23f3)

❌ Found 1 failing file with 3 issues. Please address these issues before landing. See WebKit Guidelines for Safer C++ Programming.
(cc @rniwa)

[webkit-early-warning-system]

EWS run on current version of this PR (hash 6895f50)

Details

Misc	iOS, visionOS, tvOS & watchOS	macOS	Linux	Windows	Apple Internal
✅ 🧪 style	✅ 🛠 ios	✅ 🛠 mac	✅ 🛠 wpe	✅ 🛠 win	❌ 🛠 ios-apple
	✅ 🛠 ios-sim	✅ 🛠 mac-AS-debug	✅ 🧪 wpe-wk2	🧪 win-tests	❌ 🛠 mac-apple
✅ 🧪 webkitperl	✅ 🧪 ios-wk2	✅ 🧪 api-mac	✅ 🧪 api-wpe		❌ 🛠 vision-apple
	🧪 ios-wk2-wpt	✅ 🧪 api-mac-debug	✅ 🛠 gtk3-libwebrtc
	✅ 🧪 api-ios		✅ 🛠 gtk
	✅ 🛠 ios-safer-cpp	✅ 🧪 mac-wk2	✅ 🧪 gtk-wk2
	✅ 🛠 vision	✅ 🧪 mac-AS-debug-wk2	✅ 🧪 api-gtk
✅ 🛠 🧪 merge	✅ 🛠 vision-sim	✅ 🧪 mac-wk2-stress	✅ 🛠 playstation
	✅ 🧪 vision-wk2	✅ 🧪 mac-intel-wk2
	✅ 🛠 tv	✅ 🛠 mac-safer-cpp
	✅ 🛠 tv-sim	✅ 🧪 mac-site-isolation
	✅ 🛠 watch
	✅ 🛠 watch-sim

[webkit-commit-queue]

Committed 314516@main (23a2f28): https://commits.webkit.org/314516@main

Reviewed commits have been landed. Closing PR #66351 and removing active labels.