WIP: Give developers an opt-in mechanism to block some parser-inserted scripts.

third_party/WebKit/Source/core/html/HTMLIFrameElement.h

Index: third_party/WebKit/Source/core/html/HTMLIFrameElement.h
diff --git a/third_party/WebKit/Source/core/html/HTMLIFrameElement.h b/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
index 4ac5c084e15475378c0416bf4431ce835e5a437f..1a607d554984618bde0a3e0b92e724c07a5835f6 100644
--- a/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
+++ b/third_party/WebKit/Source/core/html/HTMLIFrameElement.h
@@ -48,6 +48,7 @@ class CORE_EXPORT HTMLIFrameElement final
   DOMTokenList* sandbox() const;
   DOMTokenList* permissions() const;
   bool createdByFragmentParser() const { return m_createdByFragmentParser; }
+  bool createdByDocumentWrite() const { return m_createdByDocumentWrite; }
 
   void sandboxValueWasSet();
   void permissionsValueWasSet();
@@ -91,6 +92,7 @@ class CORE_EXPORT HTMLIFrameElement final
   bool m_allowFullscreen;
   bool m_allowPaymentRequest;
   const bool m_createdByFragmentParser;
+  const bool m_createdByDocumentWrite;
   Member<HTMLIFrameElementSandbox> m_sandbox;
   Member<HTMLIFrameElementPermissions> m_permissions;