Sending an async GET request for doc.written blocked scripts.

third_party/WebKit/Source/core/dom/ScriptLoader.h

 /*
  * Copyright (C) 2008 Nikolas Zimmermann <zimmermann@kde.org>
  *
  * 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,
  * but WITHOUT ANY WARRANTY; without even the implied warranty of
@@ skipping 70 matching lines @@
     void handleAsyncAttribute();
 
     virtual bool isReady() const { return m_pendingScript && m_pendingScript->isReady(); }
     bool errorOccurred() const { return m_pendingScript && m_pendingScript->errorOccurred(); }
 
     // Clears the connection to the PendingScript (and Element and Resource).
     void detach();
 
     bool wasCreatedDuringDocumentWrite() { return m_createdDuringDocumentWrite; }
 
+    bool disallowedFetchForDocWrittenScript() { return m_documentWriteIntervention == DocumentWriteIntervention::DoNotFetchDocWrittenScript; }
+    void setFetchDocWrittenScriptDeferIdle();
+
 protected:
     ScriptLoader(Element*, bool createdByParser, bool isEvaluated, bool createdDuringDocumentWrite);
 
 private:
     bool ignoresLoadRequest() const;
     bool isScriptForEventSupported() const;
     void logScriptMimetype(ScriptResource*, LocalFrame*, String);
 
     bool fetchScript(const String& sourceUrl, FetchRequest::DeferOption);
 
@@ skipping 13 matching lines @@
     bool m_isExternalScript : 1;
     bool m_alreadyStarted : 1;
     bool m_haveFiredLoad : 1;
     bool m_willBeParserExecuted : 1; // Same as "The parser will handle executing the script."
     bool m_readyToBeParserExecuted : 1;
     bool m_willExecuteInOrder : 1;
     bool m_willExecuteWhenDocumentFinishedParsing : 1;
     bool m_forceAsync : 1;
     const bool m_createdDuringDocumentWrite : 1;
 
+    enum DocumentWriteIntervention {
+        DocumentWriteInterventionNone = 0,
+        // Based on what shouldDisallowFetchForMainFrameScript() returns.
+        // This script will be blocked if not present in http cache.
+        DoNotFetchDocWrittenScript,
+        // If a parser blocking doc.written script was not fetched and was not
+        // present in the http cache, send a GET for it with an interventions
+        // header to allow the server to know of the intervention. This fetch
+        // will be using DeferOption::IdleLoad to keep it out of the critical
+        // path.
+        FetchDocWrittenScriptDeferIdle,

[haraken, 2016/09/07 01:47:36]

FetchDocWrittenScriptInIdleTask ?

[shivanisha, 2016/09/15 20:35:08]

used DeferIdle in the name to convey the usage of DeferOption::IdleLoad.

+    };
+
+    DocumentWriteIntervention m_documentWriteIntervention;
+
     Member<PendingScript> m_pendingScript;
 };
 
 ScriptLoader* toScriptLoaderIfPossible(Element*);
 
 } // namespace blink
 
 #endif // ScriptLoader_h