ParseHTMLOnMainThread: notify main thread of chunks less frequently

third_party/WebKit/Source/core/html/parser/BackgroundHTMLParser.h

 /*
  * Copyright (C) 2013 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 44 matching lines @@
         Configuration();
         HTMLParserOptions options;
         WeakPtr<HTMLDocumentParser> parser;
         std::unique_ptr<XSSAuditor> xssAuditor;
         std::unique_ptr<TextResourceDecoder> decoder;
         RefPtr<TokenizedChunkQueue> tokenizedChunkQueue;
         // outstandingTokenLimit must be greater than or equal to
         // pendingTokenLimit
         size_t outstandingTokenLimit;
         size_t pendingTokenLimit;
+        bool shouldCoalesceChunks;
     };
 
     static void start(PassRefPtr<WeakReference<BackgroundHTMLParser>>, std::unique_ptr<Configuration>, const KURL& documentURL, std::unique_ptr<CachedDocumentParameters>, const MediaValuesCached::MediaValuesCachedData&, std::unique_ptr<WebTaskRunner>);
 
     struct Checkpoint {
         USING_FAST_MALLOC(Checkpoint);
     public:
         WeakPtr<HTMLDocumentParser> parser;
         std::unique_ptr<HTMLToken> token;
         std::unique_ptr<HTMLTokenizer> tokenizer;
@@ skipping 13 matching lines @@
 
     void forcePlaintextForTextDocument();
 
 private:
     BackgroundHTMLParser(PassRefPtr<WeakReference<BackgroundHTMLParser>>, std::unique_ptr<Configuration>, const KURL& documentURL, std::unique_ptr<CachedDocumentParameters>, const MediaValuesCached::MediaValuesCachedData&, std::unique_ptr<WebTaskRunner>);
     ~BackgroundHTMLParser();
 
     void appendDecodedBytes(const String&);
     void markEndOfFile();
     void pumpTokenizer();
-    void sendTokensToMainThread();
+
+    // Returns whether or not the HTMLDocumentParser should be notified of
+    // pending chunks.
+    bool queueChunkForMainThread();
+    void notifyMainThreadOfNewChunks();
     void updateDocument(const String& decodedData);
 
     template <typename FunctionType, typename... Ps>
     void runOnMainThread(FunctionType, Ps&&...);
 
     WeakPtrFactory<BackgroundHTMLParser> m_weakFactory;
     BackgroundHTMLInputStream m_input;
     HTMLSourceTracker m_sourceTracker;
     std::unique_ptr<HTMLToken> m_token;
     std::unique_ptr<HTMLTokenizer> m_tokenizer;
@@ skipping 12 matching lines @@
 
     std::unique_ptr<XSSAuditor> m_xssAuditor;
     std::unique_ptr<TokenPreloadScanner> m_preloadScanner;
     std::unique_ptr<TextResourceDecoder> m_decoder;
     DocumentEncodingData m_lastSeenEncodingData;
     std::unique_ptr<WebTaskRunner> m_loadingTaskRunner;
     RefPtr<TokenizedChunkQueue> m_tokenizedChunkQueue;
 
     bool m_startingScript;
     double m_lastBytesReceivedTime;
+    bool m_shouldCoalesceChunks;
 };
 
 } // namespace blink
 
 #endif