Reland of Make run_webkit_tests random order by default for all platforms...

Reland of Make run_webkit_tests random order by default for all platforms (patchset #1 id:1 of https://codereview.chromium.org/2617563002/ )

Reason for revert:
Re-land

Original issue's description:
> Revert of Make run_webkit_tests random order by default for all platforms (patchset #2 id:20001 of https://codereview.chromium.org/2591933002/ )
>
> Reason for revert:
> fast/text/ellipsis-stroked.html started failing on some Linux and Mac bots.
>
> Original issue's description:
> > Make run_webkit_tests random order by default for all platforms.
> >
> > BUG=671805
> > R=dpranke@chromium.org,qyearsley@chromium.org
> >
> > Committed: https://crrev.com/86c477efe2039ae9f9970313769f337d8606ca95
> > Cr-Commit-Position: refs/heads/master@{#441424}
>
> TBR=dpranke@chromium.org,qyearsley@chromium.org
> # Skipping CQ checks because original CL landed less than 1 days ago.
> NOPRESUBMIT=true
> NOTREECHECKS=true
> NOTRY=true
> BUG=671805
>
> Committed: https://crrev.com/c51ad71bc112439aedbc8c8e1906f9ea098da9cc
> Cr-Commit-Position: refs/heads/master@{#441465}

TBR=dpranke@chromium.org,qyearsley@chromium.org
# Skipping CQ checks because original CL landed less than 1 days ago.
NOPRESUBMIT=true
NOTREECHECKS=true
NOTRY=true
BUG=671805

Review-Url: https://codereview.chromium.org/2612083003
Cr-Commit-Position: refs/heads/master@{#441859}

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

@@ -329,16 +329,13 @@ def parse_args(args):
             optparse.make_option(
                 "--order",
                 action="store",
-                # TODO(jeffcarp): platforms are moving to random-order by default independently.
-                # See _set_up_derived_options below and crbug.com/601332.
-                default=("default"),
+                default="random",
                 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, "
-                      "'random' == pseudo-random order. Seed can be specified "
-                      "via --seed, otherwise it will default to the current unix timestamp "
-                      "(default on Mac & Linux). "
-                      "'natural' == use the natural order (default on all others).")),
+                      "'random' == pseudo-random order (default). Seed can be specified "
+                      "via --seed, otherwise it will default to the current unix timestamp. "
+                      "'natural' == use the natural order")),
             optparse.make_option(
                 "--profile",
                 action="store_true",
@@ -566,16 +563,6 @@ def _set_up_derived_options(port, options, args):
     if not options.seed:
         options.seed = port.host.time()
 
-    # TODO(jeffcarp): This will be removed once all platforms move to random order.
-    # This must be here and not in parse_args because host is not instantiated yet there.
-    # See crbug.com/601332.
-    if options.order == 'default':
-        port_name = port.host.port_factory.get().port_name
-        if port_name.startswith(("linux-", "mac-")):
-            options.order = 'random'
-        else:
-            options.order = 'natural'
-
 def _run_tests(port, options, args, printer):
     _set_up_derived_options(port, options, args)
     manager = Manager(port, options, printer)

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

@@ -474,7 +474,7 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
         # Test that we wrap around if the number of tests is not evenly divisible by the chunk size
         # (here we end up with 3 parts, each with 2 tests, and we only have 4 tests total, so the
         # last part repeats the first two tests).
-        chunk_tests_run = get_tests_run(['--run-part', '3:3'] + tests_to_run)
+        chunk_tests_run = get_tests_run(['--order', 'natural', '--run-part', '3:3'] + tests_to_run)
         self.assertEqual(['passes/error.html', 'passes/image.html'], chunk_tests_run)
 
     def test_run_singly(self):
@@ -512,7 +512,7 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
 
     def test_stderr_is_saved(self):
         host = MockHost()
-        self.assertTrue(passing_run(host=host))
+        self.assertTrue(passing_run(['--order', 'natural'], host=host))
 
     def test_reftest_crash_log_is_saved(self):
         host = MockHost()
@@ -545,12 +545,12 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
 
         host.environ['GTEST_SHARD_INDEX'] = '0'
         host.environ['GTEST_TOTAL_SHARDS'] = '1'
-        shard_0_tests_run = get_tests_run(['--order=natural'] + tests_to_run, host=host)
+        shard_0_tests_run = get_tests_run(['--order', 'natural'] + tests_to_run, host=host)
         self.assertEqual(shard_0_tests_run, ['passes/error.html', 'passes/image.html'])
 
         host.environ['GTEST_SHARD_INDEX'] = '1'
         host.environ['GTEST_TOTAL_SHARDS'] = '1'
-        shard_1_tests_run = get_tests_run(tests_to_run, host=host)
+        shard_1_tests_run = get_tests_run(['--order', 'natural'] + tests_to_run, host=host)
         self.assertEqual(shard_1_tests_run, ['passes/platform_image.html', 'passes/text.html'])
 
     def test_smoke_test(self):
@@ -677,7 +677,9 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
         self.assertEqual(['failures/unexpected/text-image-checksum.html'], tests_run)
 
         # But we'll keep going for expected ones.
-        tests_run = get_tests_run(['failures/expected/text.html', 'passes/text.html', '--exit-after-n-failures', '1'])
+        tests_run = get_tests_run(['failures/expected/text.html', 'passes/text.html',
+                                   '--exit-after-n-failures', '1',
+                                   '--order', 'natural'])
         self.assertEqual(['failures/expected/text.html', 'passes/text.html'], tests_run)
 
     def test_exit_after_n_crashes(self):
@@ -688,11 +690,14 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
 
         # Same with timeouts.
         tests_run = get_tests_run(['failures/unexpected/timeout.html', 'passes/text.html',
-                                   '--exit-after-n-crashes-or-timeouts', '1'])
+                                   '--exit-after-n-crashes-or-timeouts', '1',
+                                   '--order', 'natural'])
         self.assertEqual(['failures/unexpected/timeout.html'], tests_run)
 
         # But we'll keep going for expected ones.
-        tests_run = get_tests_run(['failures/expected/crash.html', 'passes/text.html', '--exit-after-n-crashes-or-timeouts', '1'])
+        tests_run = get_tests_run(['failures/expected/crash.html', 'passes/text.html',
+                                   '--exit-after-n-crashes-or-timeouts', '1',
+                                   '--order', 'natural'])
         self.assertEqual(['failures/expected/crash.html', 'passes/text.html'], tests_run)
 
     def test_results_directory_absolute(self):
@@ -746,7 +751,8 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
         host = MockHost()
         filename = '/tmp/foo.txt'
         host.filesystem.write_text_file(filename, 'failures')
-        details, err, _ = logging_run(['--debug-rwt-logging', '--test-list=%s' % filename], tests_included=True, host=host)
+        details, err, _ = logging_run(['--order', 'natural', '--debug-rwt-logging', '--test-list=%s' % filename],
+                                      tests_included=True, host=host)
         self.assertEqual(details.exit_code, 0)
         self.assertIn('Retrying', err.getvalue())
 
@@ -834,7 +840,7 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
         tests_run = get_tests_run(['--order', 'natural', '-i', 'passes/virtual_passes', 'passes'])
         self.assertEqual(tests_run, sorted(tests_run))
 
-        tests_run = get_tests_run(['http/tests/passes'])
+        tests_run = get_tests_run(['--order', 'natural', 'http/tests/passes'])
         self.assertEqual(tests_run, sorted(tests_run))
 
     def test_virtual(self):