Disable form elements in MHTML

third_party/WebKit/Source/core/frame/FrameSerializer.h

 /*
  * Copyright (C) 2011 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:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 71 matching lines @@
     virtual bool rewriteLink(const Element&, String& rewrittenLink) {
       return false;
     }
 
     // Tells whether to skip serialization of a subresource or CSSStyleSheet
     // with a given URI. Used to deduplicate resources across multiple frames.
     virtual bool shouldSkipResourceWithURL(const KURL&) { return false; }
 
     // Tells whether to skip serialization of a subresource.
     virtual bool shouldSkipResource(const Resource&) { return false; }
+
+    // Returns custom attributes that need to add in order to serialize the
+    // element.
+    virtual Vector<Attribute> getCustomAttributes(const Element&) {
+      return Vector<Attribute>();
+    }
   };
 
   // Constructs a serializer that will write output to the given vector of
   // SerializedResources and uses the Delegate for controlling some
   // serialization aspects.  Callers need to ensure that both arguments stay
   // alive until the FrameSerializer gets destroyed.
   FrameSerializer(Vector<SerializedResource>&, Delegate&);
 
   // Initiates the serialization of the frame. All serialized content and
   // retrieved resources are added to the Vector passed to the constructor.
@@ skipping 28 matching lines @@
   HashSet<KURL> m_resourceURLs;
 
   bool m_isSerializingCss;
 
   Delegate& m_delegate;
 };
 
 }  // namespace blink
 
 #endif  // FrameSerializer_h