2010-11-23 Dirk Pranke <dpranke@chromium.org>

2010-11-23  Dirk Pranke  <dpranke@chromium.org>

        Reviewed by Tony Chang.

        This patch cleans up the logic used to shard tests into groups a
        bit and adds the --worker-model flag to NRWT. The flag is only
        used at the moment to control whether to run single-threaded or
        not, but eventually will also allow toggling between threads and
        processes.

        Also add a minor cleanup with _test_is_slow(), which just
        eliminates some repetition and gives slightly better encapsulation.

        https://bugs.webkit.org/show_bug.cgi?id=49773

        * Scripts/webkitpy/layout_tests/run_webkit_tests.py:
        * Scripts/webkitpy/layout_tests/run_webkit_tests_unittest.py:

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@72641 268f45cc-cd09-0410-ab3c-d52691b4dbfc