Pause HTML parser for external stylesheets in the body

third_party/WebKit/Source/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 151 matching lines @@
   }
   HTMLDocumentParser(Document&,
                      ParserContentPolicy,
                      ParserSynchronizationPolicy);
 
   // DocumentParser
   void detach() final;
   bool hasInsertionPoint() final;
   void prepareToStopParsing() final;
   void stopParsing() final;
+  bool isPaused() const {
+    return isWaitingForScripts() || m_isWaitingForStylesheets;
+  }
   bool isWaitingForScripts() const final;
   bool isExecutingScript() const final;
   void executeScriptsWaitingForResources() final;
+  void didAddPendingStylesheetInBody() final;
+  void didLoadAllBodyStylesheets() final;
+  void checkIfBodyStlyesheetAdded();
   void documentElementAvailable() override;
 
   // HTMLParserScriptRunnerHost
   void notifyScriptLoaded(PendingScript*) final;
   HTMLInputStream& inputStream() final { return m_input; }
   bool hasPreloadScanner() const final {
     return m_preloadScanner.get() && !shouldUseThreading();
   }
   void appendCurrentInputStreamToPreloadScannerAndScan() final;
 
   void startBackgroundParser();
   void stopBackgroundParser();
   void validateSpeculations(std::unique_ptr<TokenizedChunk> lastChunk);
   void discardSpeculationsAndResumeFrom(
       std::unique_ptr<TokenizedChunk> lastChunk,
       std::unique_ptr<HTMLToken>,
       std::unique_ptr<HTMLTokenizer>);
   size_t processTokenizedChunkFromBackgroundParser(
       std::unique_ptr<TokenizedChunk>);
   void pumpPendingSpeculations();
 
   bool canTakeNextToken();
   void pumpTokenizer();
   void pumpTokenizerIfPossible();
   void constructTreeFromHTMLToken();
   void constructTreeFromCompactHTMLToken(const CompactHTMLToken&);
 
   void runScriptsForPausedTreeBuilder();
-  void resumeParsingAfterScriptExecution();
+  void resumeParsingAfterPause();
 
   void attemptToEnd();
   void endIfDelayed();
   void attemptToRunDeferredScriptsAndEnd();
   void end();
 
   bool shouldUseThreading() const { return m_shouldUseThreading; }
 
   bool isParsingFragment() const;
   bool isScheduledForResume() const;
   bool inPumpSession() const { return m_pumpSessionNestingLevel > 0; }
   bool shouldDelayEnd() const {
-    return inPumpSession() || isWaitingForScripts() || isScheduledForResume() ||
+    return inPumpSession() || isPaused() || isScheduledForResume() ||
            isExecutingScript();
   }
 
   std::unique_ptr<HTMLPreloadScanner> createPreloadScanner();
 
   // Let the given HTMLPreloadScanner scan the input it has, and then preloads
   // resources using the resulting PreloadRequests and |m_preloader|.
   void scanAndPreload(HTMLPreloadScanner*);
   void fetchQueuedPreloads();
 
@@ skipping 31 matching lines @@
   // A scanner used only for input provided to the insert() method.
   std::unique_ptr<HTMLPreloadScanner> m_insertionPreloadScanner;
 
   RefPtr<WebTaskRunner> m_loadingTaskRunner;
   Member<HTMLParserScheduler> m_parserScheduler;
   HTMLSourceTracker m_sourceTracker;
   TextPosition m_textPosition;
   XSSAuditor m_xssAuditor;
   XSSAuditorDelegate m_xssAuditorDelegate;
 
-  // FIXME: m_lastChunkBeforeScript, m_tokenizer, m_token, and m_input should be
+  // FIXME: m_lastChunkBeforePause, m_tokenizer, m_token, and m_input should be
   // combined into a single state object so they can be set and cleared together
   // and passed between threads together.
-  std::unique_ptr<TokenizedChunk> m_lastChunkBeforeScript;
+  std::unique_ptr<TokenizedChunk> m_lastChunkBeforePause;
   Deque<std::unique_ptr<TokenizedChunk>> m_speculations;
   WeakPtrFactory<HTMLDocumentParser> m_weakFactory;
   WeakPtr<BackgroundHTMLParser> m_backgroundParser;
   Member<HTMLResourcePreloader> m_preloader;
   PreloadRequestStream m_queuedPreloads;
   Vector<String> m_queuedDocumentWriteScripts;
   RefPtr<TokenizedChunkQueue> m_tokenizedChunkQueue;
   std::unique_ptr<DocumentWriteEvaluator> m_evaluator;
 
   // If this is non-null, then there is a meta CSP token somewhere in the
   // speculation buffer. Preloads will be deferred until a token matching this
   // pointer is parsed and the CSP policy is applied. Note that this pointer
   // tracks the *last* meta token in the speculation buffer, so it overestimates
   // how long to defer preloads. This is for simplicity, as the alternative
   // would require keeping track of token positions of preload requests.
   CompactHTMLToken* m_pendingCSPMetaToken;
 
+  TaskHandle m_resumeParsingTaskHandle;
+
   bool m_shouldUseThreading;
   bool m_endWasDelayed;
   bool m_haveBackgroundParser;
   bool m_tasksWereSuspended;
   unsigned m_pumpSessionNestingLevel;
   unsigned m_pumpSpeculationsSessionNestingLevel;
   bool m_isParsingAtLineNumber;
   bool m_triedLoadingLinkHeaders;
+  bool m_addedPendingStylesheetInBody;
+  bool m_isWaitingForStylesheets;
 };
 
 }  // namespace blink
 
 #endif  // HTMLDocumentParser_h