In rebaseline-cl, also rebaseline tests with MISSING results.

third_party/WebKit/Tools/Scripts/webkitpy/common/net/layouttestresults_unittest.py

 # Copyright (c) 2010, Google Inc. All rights reserved.
 #
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 # notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 # copyright notice, this list of conditions and the following disclaimer
@@ skipping 47 matching lines @@
                 },
                 "prototype-strawberry.html": {
                     "expected": "PASS",
                     "actual": "IMAGE PASS",
                     "is_unexpected": true
                 },
                 "prototype-crashy.html": {
                     "expected": "PASS",
                     "actual": "CRASH",
                     "is_unexpected": true
+                },
+                "prototype-newtest.html": {
+                    "expected": "PASS",
+                    "actual": "MISSING",
+                    "is_unexpected": true,
+                    "is_missing_text": true
                 }
             }
         },
         "svg": {
             "dynamic-updates": {
                 "SVGFEDropShadowElement-dom-stdDeviation-attr.html": {
                     "expected": "PASS",
                     "actual": "IMAGE",
                     "has_stderr": true,
                     "is_unexpected": true
@@ skipping 35 matching lines @@
 
     def test_unexpected_mismatch_results(self):
         results = LayoutTestResults.results_from_string(self.example_full_results_json)
         self.assertEqual(
             [r.test_name() for r in results.unexpected_mismatch_results()],
             [
                 'fast/dom/prototype-inheritance.html',
                 'fast/dom/prototype-taco.html',
                 'svg/dynamic-updates/SVGFEDropShadowElement-dom-stdDeviation-attr.html'
             ])
+
+    def test_missing_baseline(self):
+        results = LayoutTestResults.results_from_string(self.example_full_results_json)
+        missing_results = results.missing_results()
+        self.assertEqual(len(missing_results), 1)
+        self.assertEqual(missing_results[0].test_name(), "fast/dom/prototype-newtest.html")