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

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

 /*
  * Copyright (C) 1999-2003 Lars Knoll (knoll@kde.org)
  *               1999 Waldo Bastian (bastian@kde.org)
  *               2001 Andreas Schlapbach (schlpbch@iam.unibe.ch)
  *               2001-2003 Dirk Mueller (mueller@kde.org)
  * Copyright (C) 2002, 2006, 2007, 2008, 2009, 2010 Apple Inc. All rights
  * reserved.
  * Copyright (C) 2008 David Smith (catfish.man@gmail.com)
  * Copyright (C) 2010 Google Inc. All rights reserved.
  *
@@ skipping 744 matching lines @@
 
   if (const CSSSelector* tagHistory = cs->tagHistory()) {
     switch (cs->relation()) {
       case Descendant:
         return tagHistory->selectorText(" " + str.toString() + rightSide);
       case Child:
         return tagHistory->selectorText(" > " + str.toString() + rightSide);
       case ShadowDeep:
         return tagHistory->selectorText(" /deep/ " + str.toString() +
                                         rightSide);
+      case ShadowPiercingDescendant:
+        return tagHistory->selectorText(" >>> " + str.toString() + rightSide);
       case DirectAdjacent:
         return tagHistory->selectorText(" + " + str.toString() + rightSide);
       case IndirectAdjacent:
         return tagHistory->selectorText(" ~ " + str.toString() + rightSide);
       case SubSelector:
         ASSERT_NOT_REACHED();
       case ShadowPseudo:
       case ShadowSlot:
         return tagHistory->selectorText(str.toString() + rightSide);
     }
@@ skipping 226 matching lines @@
     if (count < nthBValue())
       return false;
     return (count - nthBValue()) % nthAValue() == 0;
   }
   if (count > nthBValue())
     return false;
   return (nthBValue() - count) % (-nthAValue()) == 0;
 }
 
 }  // namespace blink