[test] lazily parse css style rules

third_party/WebKit/Source/core/css/StyleSheetContents.cpp

 /*
  * (C) 1999-2003 Lars Knoll (knoll@kde.org)
  * Copyright (C) 2004, 2006, 2007, 2012 Apple Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
  *
  * This library is distributed in the hope that it will be useful,
@@ skipping 323 matching lines @@
     CSSStyleSheetResource::MIMETypeCheck mimeTypeCheck = isQuirksModeBehavior(m_parserContext.mode()) && isSameOriginRequest ? CSSStyleSheetResource::MIMETypeCheck::Lax : CSSStyleSheetResource::MIMETypeCheck::Strict;
     String sheetText = cachedStyleSheet->sheetText(mimeTypeCheck);
 
     const ResourceResponse& response = cachedStyleSheet->response();
     m_sourceMapURL = response.httpHeaderField(HTTPNames::SourceMap);
     if (m_sourceMapURL.isEmpty()) {
         // Try to get deprecated header.
         m_sourceMapURL = response.httpHeaderField(HTTPNames::X_SourceMap);
     }
 
-    CSSParserContext context(parserContext(), UseCounter::getFrom(this));
-    CSSParser::parseSheet(context, this, sheetText);
+    CSSParser::parseSheet(parserContext(), this, sheetText);
 }
 
 void StyleSheetContents::parseString(const String& sheetText)
 {
     parseStringAtPosition(sheetText, TextPosition::minimumPosition());
 }
 
 void StyleSheetContents::parseStringAtPosition(const String& sheetText, const TextPosition& startPosition)
 {
-    CSSParserContext context(parserContext(), UseCounter::getFrom(this));
-    CSSParser::parseSheet(context, this, sheetText);
+    CSSParser::parseSheet(parserContext(), this, sheetText);
 }
 
 bool StyleSheetContents::isLoading() const
 {
     for (unsigned i = 0; i < m_importRules.size(); ++i) {
         if (m_importRules[i]->isLoading())
             return true;
     }
     return false;
 }
@@ skipping 297 matching lines @@
     visitor->trace(m_importRules);
     visitor->trace(m_namespaceRules);
     visitor->trace(m_childRules);
     visitor->trace(m_loadingClients);
     visitor->trace(m_completedClients);
     visitor->trace(m_ruleSet);
     visitor->trace(m_referencedFromResource);
 }
 
 } // namespace blink