[WIP] Compute the linkMatchType inside the CSSSelectorParser.

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 <memory>
 #include "core/css/CSSSelectorList.h"
 #include "core/css/StyleSheetContents.h"
 #include "core/css/parser/CSSParserContext.h"
@@ skipping 103 matching lines @@
 
   unsigned previous_compound_flags = 0;
 
   for (CSSParserSelector* simple = selector.get();
        simple && !previous_compound_flags; simple = simple->TagHistory())
     previous_compound_flags |= ExtractCompoundFlags(*simple, context_->Mode());
 
   while (CSSSelector::RelationType combinator = ConsumeCombinator(range)) {
     std::unique_ptr<CSSParserSelector> next_selector =
         ConsumeCompoundSelector(range);
-    if (!next_selector)
+    if (!next_selector) {
       return combinator == CSSSelector::kDescendant ? std::move(selector)
                                                     : nullptr;
+    }
     if (previous_compound_flags & kHasPseudoElementForRightmostCompound)
       return nullptr;
     CSSParserSelector* end = next_selector.get();
     unsigned compound_flags = ExtractCompoundFlags(*end, context_->Mode());
     while (end->TagHistory()) {
       end = end->TagHistory();
       compound_flags |= ExtractCompoundFlags(*end, context_->Mode());
     }
     end->SetRelation(combinator);
     if (previous_compound_flags & kHasContentPseudoElement)
       end->SetRelationIsAffectedByPseudoContent();
     previous_compound_flags = compound_flags;
     end->SetTagHistory(std::move(selector));
 
     selector = std::move(next_selector);
   }
 
+  selector->UpdateLinkMatchType();
   return selector;
 }
 
 namespace {
 
 bool IsScrollbarPseudoClass(CSSSelector::PseudoType pseudo) {
   switch (pseudo) {
     case CSSSelector::kPseudoEnabled:
     case CSSSelector::kPseudoDisabled:
     case CSSSelector::kPseudoHover:
@@ skipping 796 matching lines @@
       }
       if (current->Relation() == CSSSelector::kIndirectAdjacent)
         context_->Count(WebFeature::kCSSSelectorIndirectAdjacent);
       if (current->SelectorList())
         RecordUsageAndDeprecations(*current->SelectorList());
     }
   }
 }
 
 }  // namespace blink