Implement the ::backdrop pseudo-element for modal <dialog>.

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 143 matching lines @@
     case PseudoFirstLine:
         return FIRST_LINE;
     case PseudoFirstLetter:
         return FIRST_LETTER;
     case PseudoSelection:
         return SELECTION;
     case PseudoBefore:
         return BEFORE;
     case PseudoAfter:
         return AFTER;
+    case PseudoBackdrop:
+        return BACKDROP;
     case PseudoScrollbar:
         return SCROLLBAR;
     case PseudoScrollbarButton:
         return SCROLLBAR_BUTTON;
     case PseudoScrollbarCorner:
         return SCROLLBAR_CORNER;
     case PseudoScrollbarThumb:
         return SCROLLBAR_THUMB;
     case PseudoScrollbarTrack:
         return SCROLLBAR_TRACK;
@@ skipping 81 matching lines @@
     return NOPSEUDO;
 }
 
 static HashMap<AtomicStringImpl*, CSSSelector::PseudoType>* nameToPseudoTypeMap()
 {
     DEFINE_STATIC_LOCAL(AtomicString, active, ("active", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, after, ("after", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, any, ("-webkit-any(", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, anyLink, ("-webkit-any-link", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, autofill, ("-webkit-autofill", AtomicString::ConstructFromLiteral));
+    DEFINE_STATIC_LOCAL(AtomicString, backdrop, ("backdrop", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, before, ("before", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, checked, ("checked", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, defaultString, ("default", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, disabled, ("disabled", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, readOnly, ("read-only", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, readWrite, ("read-write", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, valid, ("valid", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, invalid, ("invalid", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, drag, ("-webkit-drag", AtomicString::ConstructFromLiteral));
     DEFINE_STATIC_LOCAL(AtomicString, dragAlias, ("-khtml-drag", AtomicString::ConstructFromLiteral)); // was documented with this name in Apple documentation, so keep an alia
@@ skipping 60 matching lines @@
     DEFINE_STATIC_LOCAL(AtomicString, unresolved, ("unresolved", AtomicString::ConstructFromLiteral));
 
     static HashMap<AtomicStringImpl*, CSSSelector::PseudoType>* nameToPseudoType = 0;
     if (!nameToPseudoType) {
         nameToPseudoType = new HashMap<AtomicStringImpl*, CSSSelector::PseudoType>;
         nameToPseudoType->set(active.impl(), CSSSelector::PseudoActive);
         nameToPseudoType->set(after.impl(), CSSSelector::PseudoAfter);
         nameToPseudoType->set(anyLink.impl(), CSSSelector::PseudoAnyLink);
         nameToPseudoType->set(any.impl(), CSSSelector::PseudoAny);
         nameToPseudoType->set(autofill.impl(), CSSSelector::PseudoAutofill);
+        nameToPseudoType->set(backdrop.impl(), CSSSelector::PseudoBackdrop);
         nameToPseudoType->set(before.impl(), CSSSelector::PseudoBefore);
         nameToPseudoType->set(checked.impl(), CSSSelector::PseudoChecked);
         nameToPseudoType->set(defaultString.impl(), CSSSelector::PseudoDefault);
         nameToPseudoType->set(disabled.impl(), CSSSelector::PseudoDisabled);
         nameToPseudoType->set(readOnly.impl(), CSSSelector::PseudoReadOnly);
         nameToPseudoType->set(readWrite.impl(), CSSSelector::PseudoReadWrite);
         nameToPseudoType->set(valid.impl(), CSSSelector::PseudoValid);
         nameToPseudoType->set(invalid.impl(), CSSSelector::PseudoInvalid);
         nameToPseudoType->set(drag.impl(), CSSSelector::PseudoDrag);
         nameToPseudoType->set(dragAlias.impl(), CSSSelector::PseudoDrag);
@@ skipping 91 matching lines @@
     bool compat = false; // single colon compatbility mode
     bool isPagePseudoClass = false; // Page pseudo-class
 
     switch (m_pseudoType) {
     case PseudoAfter:
     case PseudoBefore:
     case PseudoCue:
     case PseudoFirstLetter:
     case PseudoFirstLine:
         compat = true;
+    case PseudoBackdrop:
     case PseudoDistributed:
     case PseudoResizer:
     case PseudoScrollbar:
     case PseudoScrollbarCorner:
     case PseudoScrollbarButton:
     case PseudoScrollbarThumb:
     case PseudoScrollbarTrack:
     case PseudoScrollbarTrackPiece:
     case PseudoSelection:
     case PseudoUserAgentCustomElement:
@@ skipping 334 matching lines @@
             return false;
         return (count - m_b) % m_a == 0;
     } else {
         if (count > m_b)
             return false;
         return (m_b - count) % (-m_a) == 0;
     }
 }
 
 } // namespace WebCore