Add flag to test harness to stop sorting test cases.

tools/run-tests.py

Index: tools/run-tests.py
diff --git a/tools/run-tests.py b/tools/run-tests.py
index b02fcfa94166fa0d516645a68f46b69de90a384b..8018ba9d3d2145a724121ff0838decea27652d08 100755
--- a/tools/run-tests.py
+++ b/tools/run-tests.py
@@ -157,6 +157,9 @@ def BuildOptions():
   result.add_option("--no-snap", "--nosnap",
                     help='Test a build compiled without snapshot.',
                     default=False, dest="no_snap", action="store_true")
+  result.add_option("--no-sorting", "--nosorting",
+                    help="Don't sort tests according to duration of last run.",
+                    default=False, dest="no_sorting", action="store_true")
   result.add_option("--no-stress", "--nostress",
                     help="Don't run crankshaft --always-opt --stress-op test",
                     default=False, dest="no_stress", action="store_true")
@@ -411,7 +414,8 @@ def Execute(arch, mode, args, options, suites, workspace):
                         options.command_prefix,
                         options.extra_flags,
                         options.no_i18n,
-                        options.random_seed)
+                        options.random_seed,
+                        options.no_sorting)
 
   # TODO(all): Combine "simulator" and "simulator_run".
   simulator_run = not options.dont_skip_simulator_slow_tests and \