r97191 (bug 69874) changed the behavior of the WKBundlePageCreateSnapshot* API to return snapshots that are scaled to match the view's backing scale factor. But there's no way to figure out what the backing scale factor is from injected bundle code, so clients can't figure out how to display these snapshots correctly.
<rdar://problem/10355037>
Created attachment 112693 [details] Add WKBundlePageGetBackingScaleFactor
Committed r98588: <http://trac.webkit.org/changeset/98588>