CSS4: Implement :placeholder-shown pseudo class

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.
  *
  * This library is free software; you can redistribute it and/or
@@ skipping 206 matching lines @@
     case PseudoHover:
     case PseudoDrag:
     case PseudoFocus:
     case PseudoActive:
     case PseudoChecked:
     case PseudoEnabled:
     case PseudoFullPageMedia:
     case PseudoDefault:
     case PseudoDisabled:
     case PseudoOptional:
+    case PseudoPlaceholderShown:
     case PseudoRequired:
     case PseudoReadOnly:
     case PseudoReadWrite:
     case PseudoValid:
     case PseudoInvalid:
     case PseudoIndeterminate:
     case PseudoTarget:
     case PseudoLang:
     case PseudoNot:
     case PseudoRoot:
@@ skipping 93 matching lines @@
 {"last-child",                    CSSSelector::PseudoLastChild},
 {"last-of-type",                  CSSSelector::PseudoLastOfType},
 {"left",                          CSSSelector::PseudoLeftPage},
 {"link",                          CSSSelector::PseudoLink},
 {"no-button",                     CSSSelector::PseudoNoButton},
 {"only-child",                    CSSSelector::PseudoOnlyChild},
 {"only-of-type",                  CSSSelector::PseudoOnlyOfType},
 {"optional",                      CSSSelector::PseudoOptional},
 {"out-of-range",                  CSSSelector::PseudoOutOfRange},
 {"past",                          CSSSelector::PseudoPastCue},
+{"placeholder-shown",             CSSSelector::PseudoPlaceholderShown},
 {"read-only",                     CSSSelector::PseudoReadOnly},
 {"read-write",                    CSSSelector::PseudoReadWrite},
 {"required",                      CSSSelector::PseudoRequired},
 {"right",                         CSSSelector::PseudoRightPage},
 {"root",                          CSSSelector::PseudoRoot},
 {"scope",                         CSSSelector::PseudoScope},
 {"selection",                     CSSSelector::PseudoSelection},
 {"shadow",                        CSSSelector::PseudoShadow},
 {"single-button",                 CSSSelector::PseudoSingleButton},
 {"start",                         CSSSelector::PseudoStart},
@@ skipping 175 matching lines @@
     case PseudoListBox:
     case PseudoNoButton:
     case PseudoNot:
     case PseudoNthChild:
     case PseudoNthLastChild:
     case PseudoNthLastOfType:
     case PseudoNthOfType:
     case PseudoOnlyChild:
     case PseudoOnlyOfType:
     case PseudoOptional:
+    case PseudoPlaceholderShown:
     case PseudoOutOfRange:
     case PseudoPastCue:
     case PseudoReadOnly:
     case PseudoReadWrite:
     case PseudoRequired:
     case PseudoRoot:
     case PseudoScope:
     case PseudoSingleButton:
     case PseudoSpatialNavigationFocus:
     case PseudoStart:
@@ skipping 379 matching lines @@
         if (count < nthBValue())
             return false;
         return (count - nthBValue()) % nthAValue() == 0;
     }
     if (count > nthBValue())
         return false;
     return (nthBValue() - count) % (-nthAValue()) == 0;
 }
 
 } // namespace blink