DCHECK: load event is dispatched after executeScript() iff m_isExternalScript

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

Index: third_party/WebKit/Source/core/dom/ScriptLoader.cpp
diff --git a/third_party/WebKit/Source/core/dom/ScriptLoader.cpp b/third_party/WebKit/Source/core/dom/ScriptLoader.cpp
index e32b4516f1b353bdf0e889e6dcee3554dd61e551..e5db397ba77213fc86b5d76fee68160c46c9f7fd 100644
--- a/third_party/WebKit/Source/core/dom/ScriptLoader.cpp
+++ b/third_party/WebKit/Source/core/dom/ScriptLoader.cpp
@@ -501,6 +501,9 @@ bool ScriptLoader::prepareScript(const TextPosition& scriptStartPosition,
                        ? elementDocument.url()
                        : KURL();
 
+#if DCHECK_IS_ON()
+  DCHECK(!isExternalScript());
+#endif
   if (!executeScript(ScriptSourceCode(scriptContent(), scriptURL, position))) {
     dispatchErrorEvent();
     return false;
@@ -821,6 +824,9 @@ void ScriptLoader::execute() {
   if (errorOccurred) {
     dispatchErrorEvent();
   } else if (!m_resource->wasCanceled()) {
+#if DCHECK_IS_ON()
+    DCHECK(isExternalScript());
+#endif
     if (executeScript(source))
       dispatchLoadEvent();
     else