Re-attach renderer for progress/meter when author shadow is allowed.

Source/core/html/HTMLMeterElement.cpp

 /*
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).
  *
  * 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 193 matching lines @@
 
     RefPtrWillBeRawPtr<MeterBarElement> bar = MeterBarElement::create(document());
     m_value = MeterValueElement::create(document());
     m_value->setWidthPercentage(0);
     m_value->updatePseudo();
     bar->appendChild(m_value);
 
     inner->appendChild(bar);
 }
 
+void HTMLMeterElement::willAddFirstAuthorShadowRoot()
+{
+    ASSERT(RuntimeEnabledFeatures::authorShadowDOMForAnyElementEnabled());
+    lazyReattachIfAttached();
+}
+
 void HTMLMeterElement::trace(Visitor* visitor)
 {
     visitor->trace(m_value);
     LabelableElement::trace(visitor);
 }
 
 } // namespace