We should add a test case to ensure that we don't regress firing a mousemove event from a subframe. Ensuring that we fire a moursemove event follows from <http://www.w3.org/TR/DOM-Level-3-Events/#event-type-mousemove>.
Created attachment 88718 [details] Layout test
Committed r83228: <http://trac.webkit.org/changeset/83228>