We share code with HTMLCanvasElement via CanvasBase for allocating the backing store, with max size restrictions. transferToImageBitmap can sometimes allocate a new buffer (if there isn't one already), and it currently isn't using the same code, so doesn't have the same restrictions.
<rdar://104298886>
Pull request: https://github.com/WebKit/WebKit/pull/9088
Committed 260035@main (e4c57c810933): <https://commits.webkit.org/260035@main> Reviewed commits have been landed. Closing PR #9088 and removing active labels.