iOS previews were already implemented in BrowserTab. This adds support, so you can view BrowserTab previews on macOS. Requires https://github.com/WebKit/WebKit/pull/15081 change.
PR: https://github.com/WebKit/WebKit/pull/15082
Committed 265493@main (3c59e3a33892): <https://commits.webkit.org/265493@main> Reviewed commits have been landed. Closing PR #15082 and removing active labels.