[WPE] Introduce USE(ATK)

[carlosgcampos]

9d2e186

[WPE] Introduce USE(ATK)
https://bugs.webkit.org/show_bug.cgi?id=267508

Reviewed by Michael Catanzaro.

ENABLE_ACCESSIBILITY was removed in 273021@main, so add USE_ATK to keep
accessibility optional in the WPE port.

* Source/WebKit/PlatformWPE.cmake:
* Source/WebKit/UIProcess/API/glib/WebKitWebViewAccessible.cpp:
* Source/WebKit/UIProcess/API/glib/WebKitWebViewAccessible.h:
* Source/WebKit/UIProcess/API/wpe/PageClientImpl.cpp:
* Source/WebKit/UIProcess/API/wpe/PageClientImpl.h:
* Source/WebKit/UIProcess/API/wpe/WPEWebView.cpp:
(WKWPE::m_backend):
(WKWPE::View::~View):
* Source/WebKit/UIProcess/API/wpe/WPEWebView.h:
* Source/WebKit/UIProcess/wpe/WebPageProxyWPE.cpp:
(WebKit::WebPageProxy::bindAccessibilityTree):
* Source/cmake/OptionsGTK.cmake:
* Source/cmake/OptionsWPE.cmake:
* Tools/MiniBrowser/wpe/CMakeLists.txt:
* Tools/MiniBrowser/wpe/main.cpp:
(activate):
* Tools/wpe/backends/PlatformWPE.cmake:
* Tools/wpe/backends/ViewBackend.cpp:
(WPEToolingBackends::ViewBackend::initializeAccessibility):
(WPEToolingBackends::ViewBackend::updateAccessibilityState):
* Tools/wpe/backends/atk/ViewBackendAtk.cpp:
* Tools/wpe/backends/atk/WebKitAccessibleApplication.cpp:
* Tools/wpe/backends/atk/WebKitAccessibleApplication.h:

Canonical link: https://commits.webkit.org/276392@main

9f0c406

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
✅ 🛠 🧪 jsc	🧪 api-ios	🧪 mac-wk2	✅ 🛠 gtk
⏳ 🛠 🧪 jsc-arm64	✅ 🛠 tv	🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	✅ 🛠 tv-sim		✅ 🧪 api-gtk
	⏳ 🛠 watch		✅ 🛠 jsc-armv7
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim		✅ 🧪 jsc-armv7-tests

[webkit-early-warning-system]

EWS run on current version of this PR (hash 9f0c406)

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
✅ 🛠 🧪 jsc	🧪 api-ios	🧪 mac-wk2	✅ 🛠 gtk
⏳ 🛠 🧪 jsc-arm64	✅ 🛠 tv	🧪 mac-AS-debug-wk2	🧪 gtk-wk2
	✅ 🛠 tv-sim		✅ 🧪 api-gtk
	⏳ 🛠 watch		✅ 🛠 jsc-armv7
✅ 🛠 🧪 unsafe-merge	✅ 🛠 watch-sim		✅ 🧪 jsc-armv7-tests

[webkit-commit-queue]

Committed 276392@main (9d2e186): https://commits.webkit.org/276392@main

Reviewed commits have been landed. Closing PR #26110 and removing active labels.