[WebUI] Make CSS presubmit play nice with grit XML.

chrome/browser/resources/test_presubmit.py

 #!/usr/bin/env python
 # Copyright (c) 2012 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.
 
 """Unit tests for Web Development Style Guide checker."""
 
 import os
 import re
 import sys
@@ skipping 191 matching lines @@
 
   def VerifyContentsProducesOutput(self, contents, output):
     self.fake_file.NewContents().AndReturn(contents.splitlines())
     self.output_api.PresubmitError(
         self.fake_file_name + ':\n' + output.strip()).AndReturn(None)
     self.mox.ReplayAll()
     css_checker.CSSChecker(self.input_api, self.output_api).RunChecks()
 
   def testCssAlphaWithAtBlock(self):
     self.VerifyContentsProducesOutput("""
+<include src="../shared/css/cr/ui/overlay.css">
+<include src="chrome://resources/totally-cool.css" />
+
 /* A hopefully safely ignored comment and @media statement. /**/
 @media print {
   div {
     display: block;
     color: red;
   }
-}""", """
+<if expr="not is macosx">
+  background-image: url(chrome://resources/BLAH); /* TODO(dbeam): Fix this. */
+  background-color: rgb(235, 239, 249);
+</if>
+<if expr="is_macosx">
+  background-color: white;
+  background-image: url(chrome://resources/BLAH2);
+</if>
+}
+
+<if expr="is_macosx">
+.language-options-right {
+  visibility: hidden;
+  opacity: 1; /* TODO(dbeam): Fix this. */
+}
+</if>""", """
 - Alphabetize properties and list vendor specific (i.e. -webkit) above standard.
     display: block;
     color: red;""")
 
   def testCssAlphaWithNonStandard(self):
     self.VerifyContentsProducesOutput("""
 div {
   /* A hopefully safely ignored comment and @media statement. /**/
   color: red;
   -webkit-margin-start: 5px;
@@ skipping 182 matching lines @@
     background-position-x: 0em;
     background-position-y: 0ex;
     border-width: 0em;
     border-width: 0mm;
     height: 0cm;
     width: 0in;
 """)
 
 if __name__ == '__main__':
   unittest.main()