Renderer-side changes for NoState Prefetch

third_party/WebKit/Source/core/html/parser/HTMLDocumentParser.cpp

 /*
  * 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 112 matching lines @@
     , m_shouldUseThreading(syncPolicy == AllowAsynchronousParsing)
     , m_endWasDelayed(false)
     , m_haveBackgroundParser(false)
     , m_tasksWereSuspended(false)
     , m_pumpSessionNestingLevel(0)
     , m_pumpSpeculationsSessionNestingLevel(0)
     , m_isParsingAtLineNumber(false)
     , m_triedLoadingLinkHeaders(false)
 {
     ASSERT(shouldUseThreading() || (m_token && m_tokenizer));
+    // Threading is not allowed in prefetch mode.
+    DCHECK(!document.isPrefetchOnly() || !shouldUseThreading());
+
     ThreadState::current()->registerPreFinalizer(this);
 }
 
 HTMLDocumentParser::~HTMLDocumentParser()
 {
 }
 
 void HTMLDocumentParser::dispose()
 {
     // In Oilpan, HTMLDocumentParser can die together with Document, and
@@ skipping 647 matching lines @@
     if (isStopped())
         return;
 
     // We should never reach this point if we're using a parser thread,
     // as appendBytes() will directly ship the data to the thread.
     ASSERT(!shouldUseThreading());
 
     TRACE_EVENT1(TRACE_DISABLED_BY_DEFAULT("blink.debug"), "HTMLDocumentParser::append", "size", inputSource.length());
     const SegmentedString source(inputSource);
 
+    if (document()->isPrefetchOnly()) {
+        if (!m_preloadScanner)
+            m_preloadScanner = createPreloadScanner();
+
+        m_preloadScanner->appendToEnd(source);
+        // TODO(droger): Set the LOAD_PREFETCH flags on the requests.
+        m_preloadScanner->scanAndPreload(m_preloader.get(), document()->validBaseElementURL(), nullptr);
+
+        // Return after the preload scanner, do not actually parse the document.
+        return;
+    }
+
     if (m_preloadScanner) {
         if (m_input.current().isEmpty() && !isWaitingForScripts()) {
             // We have parsed until the end of the current input and so are now moving ahead of the preload scanner.
             // Clear the scanner so we know to scan starting from the current input point if we block again.
             m_preloadScanner.reset();
         } else {
             m_preloadScanner->appendToEnd(source);
             if (isWaitingForScripts())
                 m_preloadScanner->scanAndPreload(m_preloader.get(), document()->validBaseElementURL(), nullptr);
         }
@@ skipping 362 matching lines @@
         (*WTF::bind(function, std::forward<Ps>(parameters)...))();
         return;
     case Asynchronous:
         m_loadingTaskRunner->postTask(BLINK_FROM_HERE, WTF::bind(function, std::forward<Ps>(parameters)...));
         return;
     }
     NOTREACHED();
 }
 
 } // namespace blink