Refactor some image drag and drop codepaths

[whsieh]

a703b40

Refactor some image drag and drop codepaths
https://bugs.webkit.org/show_bug.cgi?id=245058
rdar://98992054

Reviewed by Ryosuke Niwa.

Refactor some codepaths related to dragging and dropping images.

* Source/WebCore/dom/DataTransfer.cpp:
(WebCore::DataTransfer::types const):
(WebCore::DataTransfer::filesFromPasteboardAndItemList const):
* Source/WebCore/dom/DataTransfer.h:
(WebCore::DataTransfer::allowsFileAccess const):
* Source/WebCore/page/DragController.cpp:
(WebCore::DragController::dragEntered):
(WebCore::DragController::dragExited):
(WebCore::DragController::dragUpdated):
(WebCore::DragController::performDragOperation):
(WebCore::DragController::dragEnteredOrUpdated):
(WebCore::DragController::disallowFileAccessIfNeeded):
* Source/WebCore/page/DragController.h:
* Source/WebCore/page/DragState.h:
* Source/WebCore/page/EventHandler.cpp:
(WebCore::EventHandler::canDropCurrentlyDraggedImageAsFile const):
(WebCore::EventHandler::handleDrag):
* Source/WebCore/page/EventHandler.h:
* Source/WebCore/page/SecurityOrigin.cpp:
(WebCore::SecurityOrigin::canReceiveDragData const):
* Source/WebCore/platform/DragData.cpp:
(WebCore::DragData::disallowFileAccess):
* Source/WebCore/platform/DragData.h:
* Source/WebCore/platform/cocoa/DragDataCocoa.mm:
(WebCore::DragData::containsFiles const):
(WebCore::DragData::numberOfFiles const):
(WebCore::DragData::asFilenames const):
(WebCore::DragData::containsCompatibleContent const):
(WebCore::DragData::containsPromise const):
* Source/WebKit/WebProcess/WebPage/WebPage.cpp:
(WebKit::WebPage::performDragControllerAction):
* Source/WebKit/WebProcess/WebPage/WebPage.h:
* Source/WebKitLegacy/mac/WebView/WebView.mm:
(-[WebView _enteredDataInteraction:client:global:operation:]):
(-[WebView _updatedDataInteraction:client:global:operation:]):
(-[WebView _exitedDataInteraction:client:global:operation:]):
(-[WebView _tryToPerformDataInteraction:client:global:operation:]):
(-[WebView draggingEntered:]):
(-[WebView draggingUpdated:]):
(-[WebView draggingExited:]):
(-[WebView performDragOperation:]):
* Source/WebKitLegacy/win/WebView.cpp:
(WebView::DragEnter):
(WebView::DragOver):
(WebView::DragLeave):
(WebView::Drop):

Use `WTFMove()` when handing the `DragData` over to `DragController`.

* Tools/TestWebKitAPI/Tests/WebKitCocoa/DragAndDropTests.mm:

Canonical link: https://commits.webkit.org/254380@main

34d8b50

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-early-warning-system]

34d8b50

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 254380@main (a703b40): https://commits.webkit.org/254380@main

Reviewed commits have been landed. Closing PR #4244 and removing active labels.