Defer iframe JavaScript URL evaluation

Source/core/html/HTMLFrameElementBase.cpp

Index: Source/core/html/HTMLFrameElementBase.cpp
diff --git a/Source/core/html/HTMLFrameElementBase.cpp b/Source/core/html/HTMLFrameElementBase.cpp
index 87abc68c5568c666593a5d08c5e14ac1973c4da4..ee26148c26eb3534ef12b49dd3fc0418df6cc35a 100644
--- a/Source/core/html/HTMLFrameElementBase.cpp
+++ b/Source/core/html/HTMLFrameElementBase.cpp
@@ -31,6 +31,7 @@
 #include "core/dom/Document.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
+#include "core/html/HTMLFrameJavaScriptURLOpener.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/loader/FrameLoader.h"
 #include "core/page/FocusController.h"
@@ -151,7 +152,12 @@ void HTMLFrameElementBase::didNotifySubtreeInsertionsToDocument()
     if (!SubframeLoadingDisabler::canLoadFrame(*this))
         return;
 
-    setNameAndOpenURL();
+    if (!protocolIsJavaScript(m_URL)) {
+        setNameAndOpenURL();
+        return;
+    }
+
+    HTMLFrameJavaScriptURLOpener::instance().request(this);
 }
 
 void HTMLFrameElementBase::attach(const AttachContext& context)