The Sky parser should yield before start tags

sky/engine/core/html/parser/HTMLDocumentParser.h

 /*
  * Copyright (C) 2010 Google, Inc. All Rights Reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 68 matching lines @@
         OwnPtr<CompactHTMLTokenStream> tokens;
     };
     void didReceiveParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
 
     // From DocumentParser:
     void detach() override final;
     void prepareToStopParsing() override final;
     void stopParsing() override final;
     bool isWaitingForScripts() const override final;
     bool isExecutingScript() const override final;
-    void executeScriptsWaitingForResources() override final;
+    void resumeAfterWaitingForImports() override final;
 
     UseCounter* useCounter() { return UseCounter::getFrom(contextForParsingSession()); }
 
 private:
     HTMLDocumentParser(HTMLDocument&, bool reportErrors);
 
     HTMLTreeBuilder* treeBuilder() const { return m_treeBuilder.get(); }
 
     bool hasInsertionPoint();
 
-    void startBackgroundParser();
     void stopBackgroundParser();
-    void validateSpeculations(PassOwnPtr<ParsedChunk> lastChunk);
     void processParsedChunkFromBackgroundParser(PassOwnPtr<ParsedChunk>);
     void pumpPendingSpeculations();
 
     Document* contextForParsingSession();
 
     void constructTreeFromHTMLToken(HTMLToken&);
     void constructTreeFromCompactHTMLToken(const CompactHTMLToken&);
 
     void runScriptsForPausedTreeBuilder();
-    void resumeParsingAfterScriptExecution();
 
     void attemptToEnd();
     void endIfDelayed();
     void end();
 
     bool isParsingFragment() const;
     bool isScheduledForResume() const;
     bool inPumpSession() const { return m_pumpSessionNestingLevel > 0; }
     bool shouldDelayEnd() const { return inPumpSession() || isWaitingForScripts() || isScheduledForResume() || isExecutingScript(); }
 
@@ skipping 12 matching lines @@
 
     bool m_isFragment;
     bool m_endWasDelayed;
     bool m_haveBackgroundParser;
     unsigned m_pumpSessionNestingLevel;
 };
 
 }
 
 #endif  // SKY_ENGINE_CORE_HTML_PARSER_HTMLDOCUMENTPARSER_H_