imgIDecoderObserver
aframe missing description onstartrequest() a load notification which is called at the same time that nsirequestobserver.onstartrequest() would be (used only for observers of imgirequest objects, which are nsirequests, not imgidecoder objects).
... aframe missing description onstoprequest() a load notification that is called at the same time that nsirequestobserver.onstoprequest() would be (used only for observers of imgirequest objects, which are nsirequests, not imgidecoder objects).