Change run_webkit_tests default order to random on Linux and Mac

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
index 5a4c7c8e2279652490793bc3d765336cb2ed4d05..10ac3ee577ba6dcaae056a39057ca3d456b47cda 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/run_webkit_tests.py
@@ -329,7 +329,7 @@ def parse_args(args):
             optparse.make_option(
                 "--order",
                 action="store",
-                default="natural",
+                default="random",

[qyearsley, 2016/12/14 17:58:21]

In order to temporarily keep it as "natural" by default on Windows, you could
change this to something like:

  default=("natural" if sys.platform == "win32" else "random")

Or, more verbosely but not requiring importing sys:

  default=("natural" if self.host.port_factory.get().port_name == "win" else
"random")

And add a TODO note making a reference to crbug.com/601332.

[jeffcarp, 2016/12/14 18:07:46]

Thank you so much for this!! I was worrying about how to find out how to filter
by platform in webkitpy.

                 help=("Determine the order in which the test cases will be run. "
                       "'none' == use the order in which the tests were listed "
                       "either in arguments or test list, "