Added watchdog timer to waitUntilDone to prevent a run-away test from
        hanging the test harness.

        * DumpRenderTree/DumpRenderTree.m:
        (dump):
        (-[LayoutTestController waitUntilDone]):
        (-[LayoutTestController waitUntilDoneWatchdogFired]):
        * DumpRenderTree/DumpRenderTree.xcodeproj/project.pbxproj:



git-svn-id: http://svn.webkit.org/repository/webkit/trunk@24376 268f45cc-cd09-0410-ab3c-d52691b4dbfc