Per discussion on the public_webgl mailing list, there was broad support (including from Mozilla) for exposing the ArrayBufferView superinterface of all of the typed array views on DOMWindow. This has been done and the conformance tests updated; the new constructor needs to be exposed in WebKit.
Created attachment 180468 [details] Patch
Comment on attachment 180468 [details] Patch Clearing flags on attachment: 180468 Committed r138393: <http://trac.webkit.org/changeset/138393>
All reviewed patches have been landed. Closing bug.