Add :indeterminate pseudo class support for radio button input

Source/core/html/forms/RadioButtonGroupScope.cpp

 /*
  * Copyright (C) 2007, 2008, 2009 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 94 matching lines @@
     ASSERT(m_members.contains(button));
     bool wasValid = isValid();
     if (button->checked()) {
         setCheckedButton(button);
     } else {
         if (m_checkedButton == button)
             m_checkedButton = nullptr;
     }
     if (wasValid != isValid())
         setNeedsValidityCheckForAllButtons();
+    typedef WillBeHeapHashSet<RawPtrWillBeMember<HTMLInputElement> >::const_iterator Iterator;
+    Iterator end = m_members.end();
+    for (Iterator it = m_members.begin(); it != end; ++it) {
+        (*it)->didAffectSelector(AffectedSelectorIndeterminate);
+    }
 }
 
 void RadioButtonGroup::requiredAttributeChanged(HTMLInputElement* button)
 {
     ASSERT(button->isRadioButton());
     ASSERT(m_members.contains(button));
     bool wasValid = isValid();
     if (button->isRequired()) {
         ++m_requiredCount;
     } else {
@@ skipping 150 matching lines @@
 }
 
 void RadioButtonGroupScope::trace(Visitor* visitor)
 {
 #if ENABLE(OILPAN)
     visitor->trace(m_nameToGroupMap);
 #endif
 }
 
 } // namespace