Add use counter for indirect adjacent selectors.

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"
@@ skipping 44 matching lines @@
                 break;
             case CSSSelector::PseudoSpatialNavigationFocus:
                 if (context.mode() != UASheetMode)
                     feature = UseCounter::CSSSelectorInternalPseudoSpatialNavigationFocus;
                 break;
             default:
                 break;
             }
             if (feature != UseCounter::NumberOfFeatures)
                 context.useCounter()->count(feature);
+            if (current->relation() == CSSSelector::IndirectAdjacent)
+                context.useCounter()->count(UseCounter::CSSSelectorIndirectAdjacent);
             if (current->selectorList())
                 recordSelectorStats(context, *current->selectorList());
         }
     }
 }
 
 CSSSelectorList CSSSelectorParser::parseSelector(CSSParserTokenRange range, const CSSParserContext& context, StyleSheetContents* styleSheet)
 {
     CSSSelectorParser parser(context, styleSheet);
     range.consumeWhitespace();
@@ skipping 704 matching lines @@
 
     if (!splitAfter || !splitAfter->tagHistory())
         return compoundSelector;
 
     OwnPtr<CSSParserSelector> secondCompound = splitAfter->releaseTagHistory();
     secondCompound->appendTagHistory(secondCompound->pseudoType() == CSSSelector::PseudoSlotted ? CSSSelector::ShadowSlot : CSSSelector::ShadowPseudo, compoundSelector);
     return secondCompound.release();
 }
 
 } // namespace blink