<rdar://101591380> transferToImageBitmap can be called when we were unable to allocate a bitmap, we should handle this the same way as HTMLCanvasElement::toBlob and return null.
Pull request: https://github.com/WebKit/WebKit/pull/5947
Committed 256178@main (cc6c9a484504): <https://commits.webkit.org/256178@main> Reviewed commits have been landed. Closing PR #5947 and removing active labels.