Add a way to mark a test as missing expectations. We avoided added this...

webkit/tools/layout_tests/layout_package/compare_failures.py

 # Copyright (c) 2006-2008 The Chromium Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 """A helper class for comparing the failures and crashes from a test run
 against what we expected to happen (as specified in test_expectations.txt)."""
 
 import errno
 import os
 
@@ skipping 100 matching lines @@
     PrintFilesFromSet(self._regressed_hangs,
                       "Regressions: Unexpected timeouts",
                       output,
                       'TIMEOUT')
     PrintFilesFromSet(self._regressed_crashes,
                       "Regressions: Unexpected crashes",
                       output,
                       'CRASH')
     PrintFilesFromSet(self._missing,
                       "Missing expected results",
-                      output)
+                      output,
+                      'MISSING')
 
   def _CalculateRegressions(self):
     """Calculate regressions from this run through the layout tests."""
     worklist = self._test_files.copy()
 
     passes = set()
     crashes = set()
     hangs = set()
     missing = set()
     image_failures = set()
@@ skipping 17 matching lines @@
 
       expectations = self._expectations.GetExpectations(test)
       if is_crash:
         if not test_expectations.CRASH in expectations: crashes.add(test)
       elif is_hang:
         if not test_expectations.TIMEOUT in expectations: hangs.add(test)
       # Do not add to the missing list if a test is rebaselining and missing
       # expected files.
       elif (is_missing and
             not self._expectations.IsRebaselining(test) and
-            not self._expectations.IsIgnored(test)):
+            not self._expectations.IsIgnored(test) and
+            (test_expectations.MISSING not in
+             self._expectations.GetExpectations(test))):
         missing.add(test)
       elif is_image_failure and is_text_failure:
         if (not test_expectations.FAIL in expectations and
             not test_expectations.IMAGE_PLUS_TEXT in expectations):
             image_plus_text_failures.add(test)
       elif is_image_failure:
         if (not test_expectations.FAIL in expectations and
             not test_expectations.IMAGE in expectations):
             image_failures.add(test)
       elif is_text_failure:
@@ skipping 19 matching lines @@
 
   def GetRegressions(self):
     """Returns a set of regressions from the test expectations. This is
     used to determine which tests to list in results.html and the
     right script exit code for the build bots. The list does not
     include the unexpected passes."""
     return (self._regressed_text_failures | self._regressed_image_failures |
             self._regressed_image_plus_text_failures | self._regressed_hangs |
             self._regressed_crashes | self._missing)