Check whether ScriptResource is still loading due to revalidation

third_party/WebKit/Source/core/dom/PendingScript.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 203 matching lines @@
 }
 
 DEFINE_TRACE(PendingScript) {
   visitor->trace(m_element);
   visitor->trace(m_streamer);
   visitor->trace(m_client);
   ResourceOwner<ScriptResource>::trace(visitor);
   MemoryCoordinatorClient::trace(visitor);
 }
 
-ScriptSourceCode PendingScript::getSource(const KURL& documentURL,
-                                          bool& errorOccurred) const {
+NOINLINE ScriptSourceCode PendingScript::getSource(const KURL& documentURL,
+                                                   bool& errorOccurred) const {
   checkState();
 
   errorOccurred = this->errorOccurred();
   if (resource()) {
-    DCHECK(resource()->isLoaded());
+    // For investigating https://crbug.com/692856.
+    CHECK(resource()->isLoaded() ||
+          (resource()->isLoading() && resource()->hasRevalidated()));
+    CHECK(resource()->isLoaded() ||
+          (resource()->isLoading() && resource()->isCacheValidator()));
+    CHECK(resource()->isLoaded());
+
     if (m_streamer && !m_streamer->streamingSuppressed())
       return ScriptSourceCode(m_streamer, resource());
     return ScriptSourceCode(resource());
   }
 
   return ScriptSourceCode(m_element->textContent(), documentURL,
                           startingPosition());
 }
 
 void PendingScript::setStreamer(ScriptStreamer* streamer) {
@@ skipping 22 matching lines @@
 
 void PendingScript::onPurgeMemory() {
   checkState();
   if (!m_streamer)
     return;
   m_streamer->cancel();
   m_streamer = nullptr;
 }
 
 }  // namespace blink