run-webkit-tests: Extract slowness information from MANIFEST.json.

third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
index d7b4232e301ab81d756d55a4f16c04b565ff3de7..7ed2e29b7b96a83aa98b31a2d7e56c428f31f29a 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/layout_tests/port/base_unittest.py
@@ -251,6 +251,9 @@ class PortTest(unittest.TestCase):
                     'dom/ranges/Range-attributes.html': [
                         ['/dom/ranges/Range-attributes.html', {}]
                     ],
+                    'dom/ranges/Range-attributes-slow.html': [
+                        ['/dom/ranges/Range-attributes.html', {'timeout': 'long'}]
+                    ],
                     'console/console-is-a-namespace.any.js': [
                         ['/console/console-is-a-namespace.any.html', {}],
                         ['/console/console-is-a-namespace.any.worker.html', {}],
@@ -321,6 +324,15 @@ class PortTest(unittest.TestCase):
         # A file in external/wpt_automation.
         self.assertTrue(port.is_test_file(filesystem, LAYOUT_TEST_DIR + '/external/wpt_automation', 'foo.html'))
 
+    def test_is_slow_wpt_test(self):
+        port = self.make_port(with_tests=True)
+        filesystem = port.host.filesystem
+        PortTest._add_manifest_to_mock_file_system(filesystem)
+
+        self.assertFalse(port.is_slow_wpt_test('external/wpt/dom/ranges/Range-attributes.html'))
+        self.assertFalse(port.is_slow_wpt_test('dom/ranges/Range-attributes.html'))
+        self.assertTrue(port.is_slow_wpt_test('external/wpt/dom/ranges/Range-attributes-slow.html'))
+
     def test_parse_reftest_list(self):
         port = self.make_port(with_tests=True)
         port.host.filesystem.files['bar/reftest.list'] = "\n".join(["== test.html test-ref.html",