Parser support for >>> (shadow-piercing descendant) combinator.

third_party/WebKit/Source/core/css/SelectorChecker.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, 2013 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/)
@@ skipping 379 matching lines @@
               context.element->treeScope())
         return SelectorFailsCompletely;
 
       Element* shadowHost = context.element->ownerShadowHost();
       if (!shadowHost)
         return SelectorFailsCompletely;
       nextContext.element = shadowHost;
       return matchSelector(nextContext, result);
     }
 
+    case CSSSelector::ShadowPiercingDescendant:
     case CSSSelector::ShadowDeep: {
       if (!m_isUARule && !m_isQuerySelector)
         Deprecation::countDeprecation(context.element->document(),
                                       UseCounter::CSSDeepCombinator);
       if (ShadowRoot* root = context.element->containingShadowRoot()) {
         if (root->type() == ShadowRootType::UserAgent)
           return SelectorFailsCompletely;
       }
 
       if (context.selector->relationIsAffectedByPseudoContent()) {
@@ skipping 867 matching lines @@
 }
 
 bool SelectorChecker::matchesFocusPseudoClass(const Element& element) {
   if (InspectorInstrumentation::forcePseudoState(const_cast<Element*>(&element),
                                                  CSSSelector::PseudoFocus))
     return true;
   return element.isFocused() && isFrameFocused(element);
 }
 
 }  // namespace blink