Add test to see if async I/O has completed before we actually yield the thread. Part of the I/O improvments tagged under bug #3536. Approved wtc.
Add test to see if async I/O has completed before we actually yield the thread. Part of the I/O improvments tagged under bug #3536. Approved wtc.

makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub,makotokato/nsprpub