List marker pseudo elements.

Source/core/css/CSSTestHelper.cpp

 /*
  * Copyright (c) 2014, 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:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 43 matching lines @@
 
 RuleSet& CSSTestHelper::ruleSet()
 {
     RuleSet& ruleSet = m_styleSheet->contents()->ensureRuleSet(MediaQueryEvaluator(), RuleHasNoSpecialState);
     ruleSet.compactRulesIfNeeded();
     return ruleSet;
 }
 
 void CSSTestHelper::addCSSRules(const char* cssText)
 {
-    TextPosition position;
     unsigned sheetLength = m_styleSheet->length();
-    m_styleSheet->contents()->parseStringAtPosition(cssText, position, true);
+    tryAddCSSRules(cssText);
     ASSERT_TRUE(m_styleSheet->length() > sheetLength);
 }
 
+void CSSTestHelper::tryAddCSSRules(const char* cssText)
+{
+    TextPosition position;
+    m_styleSheet->contents()->parseStringAtPosition(cssText, position, true);
+}
+
 } // namespace blink