Add support for --gtest_repeat to run-webkit-tests

The context for this change is to allow FindIt, which only speaks GTest,
to run run-webkit-tests.

Bug: 650747
Change-Id: Ic4930cda309395f1a19a619a701140909f6f296c
Reviewed-on: https://chromium-review.googlesource.com/541757
Commit-Queue: Jeff Carpenter <jeffcarp@chromium.org>
Reviewed-by: Quinten Yearsley <qyearsley@chromium.org>
Cr-Commit-Position: refs/heads/master@{#481064}

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

@@ -369,6 +369,7 @@ def parse_args(args):
                 help='Output per-test profile information, using the specified profiler.'),
             optparse.make_option(
                 '--repeat-each',
+                '--gtest_repeat',
                 type='int',
                 default=1,
                 help='Number of times to run each test (e.g. AAABBBCCC)'),

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

@@ -394,6 +394,16 @@ class RunTest(unittest.TestCase, StreamTestingMixin):
         tests_run = get_tests_run(['--repeat-each', '2', '--order', 'natural'] + tests_to_run)
         self.assertEqual(tests_run, ['passes/image.html', 'passes/image.html', 'passes/text.html', 'passes/text.html'])
 
+    def test_gtest_repeat(self):
+        tests_to_run = ['passes/image.html', 'passes/text.html']
+        tests_run = get_tests_run(['--gtest_repeat', '2', '--order', 'natural'] + tests_to_run)
+        self.assertEqual(tests_run, ['passes/image.html', 'passes/image.html', 'passes/text.html', 'passes/text.html'])
+
+    def test_gtest_repeat_overrides_repeat_each(self):
+        tests_to_run = ['passes/image.html', 'passes/text.html']
+        tests_run = get_tests_run(['--repeat-each', '4', '--gtest_repeat', '2', '--order', 'natural'] + tests_to_run)
+        self.assertEqual(tests_run, ['passes/image.html', 'passes/image.html', 'passes/text.html', 'passes/text.html'])
+
     def test_ignore_flag(self):
         # Note that passes/image.html is expected to be run since we specified it directly.
         tests_run = get_tests_run(['-i', 'passes', 'passes/image.html'])