Implement ::placeholder CSS selector.

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/)
@@ skipping 202 matching lines @@
       m_cuePseudoRules.append(ruleData);
       return true;
     case CSSSelector::PseudoLink:
     case CSSSelector::PseudoVisited:
     case CSSSelector::PseudoAnyLink:
       m_linkPseudoClassRules.append(ruleData);
       return true;
     case CSSSelector::PseudoFocus:
       m_focusPseudoClassRules.append(ruleData);
       return true;
+    case CSSSelector::PseudoPlaceholder:
+      m_placeholderPseudoRules.append(ruleData);
+      return true;
     default:
       break;
   }
 
   if (!tagName.isEmpty()) {
     addToRuleSet(tagName, ensurePendingRules()->tagRules, ruleData);
     return true;
   }
 
   if (component.isHostPseudoClass()) {
@@ skipping 131 matching lines @@
   ASSERT(m_pendingRules);
   PendingRuleMaps* pendingRules = m_pendingRules.release();
   compactPendingRules(pendingRules->idRules, m_idRules);
   compactPendingRules(pendingRules->classRules, m_classRules);
   compactPendingRules(pendingRules->tagRules, m_tagRules);
   compactPendingRules(pendingRules->shadowPseudoElementRules,
                       m_shadowPseudoElementRules);
   m_linkPseudoClassRules.shrinkToFit();
   m_cuePseudoRules.shrinkToFit();
   m_focusPseudoClassRules.shrinkToFit();
+  m_placeholderPseudoRules.shrinkToFit();
   m_universalRules.shrinkToFit();
   m_shadowHostRules.shrinkToFit();
   m_pageRules.shrinkToFit();
   m_fontFaceRules.shrinkToFit();
   m_keyframesRules.shrinkToFit();
   m_deepCombinatorOrShadowPseudoRules.shrinkToFit();
   m_contentPseudoElementRules.shrinkToFit();
   m_slottedPseudoElementRules.shrinkToFit();
 }
 
@@ skipping 13 matching lines @@
 }
 
 DEFINE_TRACE(RuleSet) {
   visitor->trace(m_idRules);
   visitor->trace(m_classRules);
   visitor->trace(m_tagRules);
   visitor->trace(m_shadowPseudoElementRules);
   visitor->trace(m_linkPseudoClassRules);
   visitor->trace(m_cuePseudoRules);
   visitor->trace(m_focusPseudoClassRules);
+  visitor->trace(m_placeholderPseudoRules);
   visitor->trace(m_universalRules);
   visitor->trace(m_shadowHostRules);
   visitor->trace(m_features);
   visitor->trace(m_pageRules);
   visitor->trace(m_fontFaceRules);
   visitor->trace(m_keyframesRules);
   visitor->trace(m_deepCombinatorOrShadowPseudoRules);
   visitor->trace(m_contentPseudoElementRules);
   visitor->trace(m_slottedPseudoElementRules);
   visitor->trace(m_viewportDependentMediaQueryResults);
   visitor->trace(m_deviceDependentMediaQueryResults);
   visitor->trace(m_pendingRules);
 #ifndef NDEBUG
   visitor->trace(m_allRules);
 #endif
 }
 
 #ifndef NDEBUG
 void RuleSet::show() const {
   for (const auto& rule : m_allRules)
     rule.selector().show();
 }
 #endif
 
 }  // namespace blink