Introduce :-internal-shadow-host-has-appearance pseudo class, and apply it to METER element.

third_party/WebKit/Source/core/css/RuleSet.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 2004-2005 Allan Sandfeld Jensen (kde@carewolf.com)
  * Copyright (C) 2006, 2007 Nicholas Shanks (webkit@nickshanks.com)
  * Copyright (C) 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Apple Inc. All rights reserved.
  * Copyright (C) 2007 Alexey Proskuryakov <ap@webkit.org>
  * Copyright (C) 2007, 2008 Eric Seidel <eric@webkit.org>
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved. (http://www.torchmobile.com/)
  * Copyright (c) 2011, Code Aurora Forum. All rights reserved.
  * Copyright (C) Research In Motion Limited 2011. All rights reserved.
@@ skipping 126 matching lines @@
     case CSSSelector::Class:
         className = selector->value();
         break;
     case CSSSelector::Tag:
         if (selector->tagQName().localName() != starAtom)
             tagName = selector->tagQName().localName();
         break;
     default:
         break;
     }
-    if (selector->getPseudoType() == CSSSelector::PseudoWebKitCustomElement)
+    if (selector->getPseudoType() == CSSSelector::PseudoWebKitCustomElement || selector->getPseudoType() == CSSSelector::PseudoBlinkInternalElement)
         customPseudoElementName = selector->value();
 }
 
 bool RuleSet::findBestRuleSetAndAdd(const CSSSelector& component, RuleData& ruleData)
 {
     AtomicString id;
     AtomicString className;
     AtomicString customPseudoElementName;
     AtomicString tagName;
 
@@ skipping 236 matching lines @@
 
 #ifndef NDEBUG
 void RuleSet::show() const
 {
     for (const auto& rule: m_allRules)
         rule.selector().show();
 }
 #endif
 
 } // namespace blink