Implement the use counter for :defined pseudo-class selector

third_party/WebKit/Source/core/css/parser/CSSSelectorParser.cpp

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "core/css/parser/CSSSelectorParser.h"
 
 #include "core/css/CSSSelectorList.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/frame/UseCounter.h"
 #include "platform/RuntimeEnabledFeatures.h"
 
 namespace blink {
 
 static void recordSelectorStats(const CSSParserContext& context, const CSSSelectorList& selectorList)
 {
     if (!context.useCounter())
         return;
 
     for (const CSSSelector* selector = selectorList.first(); selector; selector = CSSSelectorList::next(*selector)) {
         for (const CSSSelector* current = selector; current ; current = current->tagHistory()) {
             UseCounter::Feature feature = UseCounter::NumberOfFeatures;
             switch (current->getPseudoType()) {
             case CSSSelector::PseudoAny:
                 feature = UseCounter::CSSSelectorPseudoAny;
                 break;
             case CSSSelector::PseudoUnresolved:
                 feature = UseCounter::CSSSelectorPseudoUnresolved;
                 break;
+            case CSSSelector::PseudoDefined:
+                feature = UseCounter::CSSSelectorPseudoDefined;
+                break;
             case CSSSelector::PseudoSlotted:
                 feature = UseCounter::CSSSelectorPseudoSlotted;
                 break;
             case CSSSelector::PseudoContent:
                 feature = UseCounter::CSSSelectorPseudoContent;
                 break;
             case CSSSelector::PseudoHost:
                 feature = UseCounter::CSSSelectorPseudoHost;
                 break;
             case CSSSelector::PseudoHostContext:
@@ skipping 753 matching lines @@
 
     if (!splitAfter || !splitAfter->tagHistory())
         return compoundSelector;
 
     OwnPtr<CSSParserSelector> secondCompound = splitAfter->releaseTagHistory();
     secondCompound->appendTagHistory(secondCompound->pseudoType() == CSSSelector::PseudoSlotted ? CSSSelector::ShadowSlot : CSSSelector::ShadowPseudo, std::move(compoundSelector));
     return secondCompound;
 }
 
 } // namespace blink