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

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

Index: third_party/WebKit/Source/core/dom/ScriptLoader.h
diff --git a/third_party/WebKit/Source/core/dom/ScriptLoader.h b/third_party/WebKit/Source/core/dom/ScriptLoader.h
index 24f3ebd7e0b67ad6d76412f07751c1a0f73a65fe..251a55a9b3f30dccff0bce1665fa462decf8f399 100644
--- a/third_party/WebKit/Source/core/dom/ScriptLoader.h
+++ b/third_party/WebKit/Source/core/dom/ScriptLoader.h
@@ -88,6 +88,9 @@ public:
 
     bool wasCreatedDuringDocumentWrite() { return m_createdDuringDocumentWrite; }
 
+    bool disallowedFetchForDocWrittenScript() { return m_documentWriteIntervention == DocumentWriteIntervention::DoNotFetchDocWrittenScript; }
+    void setFetchDocWrittenScriptDeferIdle();
+
 protected:
     ScriptLoader(Element*, bool createdByParser, bool isEvaluated, bool createdDuringDocumentWrite);
 
@@ -121,6 +124,21 @@ private:
     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;
 };