[webkit-changes] [WebKit/WebKit] 591cf1: [iOS] Adopt API replacements for returning an "act...

[Wenson Hsieh]

  Branch: refs/heads/main
  Home:   https://github.com/WebKit/WebKit
  Commit: 591cf102f2e83039b430ad5a8b78e3992f17895b
      https://github.com/WebKit/WebKit/commit/591cf102f2e83039b430ad5a8b78e3992f17895b
  Author: Wenson Hsieh <wenson_hsieh at apple.com>
  Date:   2023-12-04 (Mon, 04 Dec 2023)

  Changed paths:
    M Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeScrollingNodeDelegateIOS.mm
    M Source/WebKit/UIProcess/ios/WKBaseScrollView.h
    M Source/WebKit/UIProcess/ios/WKBaseScrollView.mm

  Log Message:
  -----------
  [iOS] Adopt API replacements for returning an "acting parent UIScrollView"
https://bugs.webkit.org/show_bug.cgi?id=265801
rdar://119141181

Reviewed by Aditya Keerthi and Megan Gardner.

Adopt a soon-to-be API replacement for this SPI scroll view delegate method:

```
-[UIScrollViewDelegate _actingParentScrollViewForScrollView:]
```

The replacement is just a subclassing hook on `UIScrollView` directly, which we can easily route
through our own `WKBaseScrollViewDelegate`, which allows us to share an implementation with the
legacy `-_actingParentScrollViewForScrollView:` delegate method.

* Source/WebKit/UIProcess/RemoteLayerTree/ios/ScrollingTreeScrollingNodeDelegateIOS.mm:
(-[WKScrollingNodeScrollViewDelegate _actingParentScrollViewForScrollView:]):
(-[WKScrollingNodeScrollViewDelegate actingParentScrollViewForScrollView:]):
* Source/WebKit/UIProcess/ios/WKBaseScrollView.h:
* Source/WebKit/UIProcess/ios/WKBaseScrollView.mm:
(-[WKBaseScrollView _actingParentScrollView]):

Canonical link: https://commits.webkit.org/271512@main