When importing wpt tests, add skip expectations for tests with missing results.

third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_expectations_updater_unittest.py

Index: third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_expectations_updater_unittest.py
diff --git a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_expectations_updater_unittest.py b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_expectations_updater_unittest.py
index 9b09e6f395987d33c52d37258de2a65a16b7a6a5..4dd0d76d67c554b7d05fcc4017ac715f923b45aa 100644
--- a/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_expectations_updater_unittest.py
+++ b/third_party/WebKit/Tools/Scripts/webkitpy/w3c/wpt_expectations_updater_unittest.py
@@ -185,6 +185,12 @@ class WPTExpectationsUpdaterTest(LoggingTestCase):
         self.assertEqual(
             updater.get_expectations({'expected': 'Pass', 'actual': 'IMAGE+TEXT IMAGE IMAGE'}),
             {'Failure'})
+        self.assertEqual(
+            updater.get_expectations({'expected': 'Pass', 'actual': 'MISSING'}),
+            {'Skip'})
+        self.assertEqual(
+            updater.get_expectations({'expected': 'Pass', 'actual': 'TIMEOUT'}, test_name='foo/bar-manual.html'),
+            {'Skip'})
 
     def test_create_line_list_old_tests(self):
         # In this example, there are two failures that are not in w3c tests.