Handle parser-blocking script cancellations while nested.

Source/core/html/parser/HTMLScriptRunner.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 147 matching lines @@
     }
     // The exact value doesn't matter; valid time stamps are much bigger than this value.
     const double epsilon = 1;
     if (pendingScriptType == PendingScript::ParsingBlocking && !m_parserBlockingScriptAlreadyLoaded && compilationFinishTime > epsilon && loadFinishTime > epsilon) {
         blink::Platform::current()->histogramCustomCounts("WebCore.Scripts.ParsingBlocking.TimeBetweenLoadedAndCompiled", (compilationFinishTime - loadFinishTime) * 1000, 0, 10000, 50);
     }
 
     ASSERT(!isExecutingScript());
 }
 
+void HTMLScriptRunner::stopWatchingResourceForLoad(Resource* resource)
+{
+    if (m_parserBlockingScript.resource() == resource) {
+        m_parserBlockingScript.stopWatchingForLoad(this);
+        m_parserBlockingScript.releaseElementAndClear();
+        return;
+    }
+    for (PendingScript& script : m_scriptsToExecuteAfterParsing) {
+        if (script.resource() == resource) {
+            script.stopWatchingForLoad(this);
+            script.releaseElementAndClear();
+            return;
+        }
+    }
+}
+
 void HTMLScriptRunner::notifyFinished(Resource* cachedResource)
 {
+    // Handle cancellations of parser-blocking script loads without
+    // notifying the host (i.e., parser) if these were initiated by nested
+    // document.write()s. The cancellation may have been triggered by
+    // script execution to signal an abrupt stop (e.g., window.close().)
+    //
+    // The parser is unprepared to be told, and doesn't need to be.
+    if (isExecutingScript() && cachedResource->wasCanceled()) {
+        stopWatchingResourceForLoad(cachedResource);
+        return;
+    }
     m_host->notifyScriptLoaded(cachedResource);
 }
 
 // Implements the steps for 'An end tag whose tag name is "script"'
 // http://whatwg.org/html#scriptEndTag
 // Script handling lives outside the tree builder to keep each class simple.
 void HTMLScriptRunner::execute(PassRefPtrWillBeRawPtr<Element> scriptElement, const TextPosition& scriptStartPosition)
 {
     ASSERT(scriptElement);
     // FIXME: If scripting is disabled, always just return.
@@ skipping 162 matching lines @@
 
 void HTMLScriptRunner::trace(Visitor* visitor)
 {
     visitor->trace(m_document);
     visitor->trace(m_host);
     visitor->trace(m_parserBlockingScript);
     visitor->trace(m_scriptsToExecuteAfterParsing);
 }
 
 }