Fix compiler_customization_test.py by including polymer externs

third_party/closure_compiler/compiler_customization_test.py

 #!/usr/bin/env python
 # Copyright 2014 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.
 
 import os
 import unittest
 
 from compile import Checker
 from processor import FileCache, Processor
 
 
 _SCRIPT_DIR = os.path.dirname(os.path.abspath(__file__))
 _SRC_DIR = os.path.join(_SCRIPT_DIR, os.pardir, os.pardir)
 _RESOURCES_DIR = os.path.join(_SRC_DIR, "ui", "webui", "resources", "js")
 _ASSERT_JS = os.path.join(_RESOURCES_DIR, "assert.js")
 _CR_JS = os.path.join(_RESOURCES_DIR, "cr.js")
 _CR_UI_JS = os.path.join(_RESOURCES_DIR, "cr", "ui.js")
+_POLYMER_EXTERNS = os.path.join(_SRC_DIR, "third_party", "polymer", "v0_8",
+                                "components-chromium", "polymer-externs",
+                                "polymer.externs.js")
 
 
 class CompilerCustomizationTest(unittest.TestCase):
   _ASSERT_DEFINITION = Processor(_ASSERT_JS).contents
   _CR_DEFINE_DEFINITION = Processor(_CR_JS).contents
   _CR_UI_DECORATE_DEFINITION = Processor(_CR_UI_JS).contents
 
   def setUp(self):
     self._checker = Checker()
 
   def _runChecker(self, source_code):
     file_path = "/script.js"
     FileCache._cache[file_path] = source_code
-    return self._checker.check(file_path)
+    return self._checker.check(file_path, externs=[_POLYMER_EXTERNS])
 
   def _runCheckerTestExpectError(self, source_code, expected_error):
     _, stderr = self._runChecker(source_code)
 
     self.assertTrue(expected_error in stderr,
         msg="Expected chunk: \n%s\n\nOutput:\n%s\n" % (
             expected_error, stderr))
 
   def _runCheckerTestExpectSuccess(self, source_code):
     found_errors, stderr = self._runChecker(source_code)
@@ skipping 185 matching lines @@
 function f() {
   var a = document.createElement('div');
   cr.ui.decorate(a, Class);
   return a;
 }
 """)
 
 
 if __name__ == "__main__":
   unittest.main()