<https://bugs.webkit.org/show_bug.cgi?id=17678>

        We now abort tests that take longer than 60 seconds to produce output.
        This matches the watchdog timer in DRT/mac and DRT/win (which we can
        now remove).

        Reviewed by Eric Seidel.

        * Scripts/run-webkit-tests:
        (top level): Read DRT's output using the new readFromDumpToolWithTimer
        subroutine. If readFromDumpToolWithTimer returns undefined it means
        the test timed out, so we register the test as a hang and move on.
        (sub testCrashedOrTimedOut): Renamed from testCrashed. Now handles
        both crashed and timed out tests. If the test timed out, we kill DRT
        before returning.
        (sub linksForTimedOutTest): Added. We don't have any output to link to for
        tests that timed out.
        (sub recordActualResultsAndDiff): Don't call length on undefined.
        (sub readFromDumpToolWithTimer): Added. Performs non-blocking reads
        from a filehandle until an #EOF is reached or
        $maximumSecondsWithoutOutput have elapsed.
        (sub setFileHandleNonBlocking): Marks a filehandle as blocking or
        non-blocking.


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@32028 268f45cc-cd09-0410-ab3c-d52691b4dbfc