Disable form elements in MHTML

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

Index: third_party/WebKit/Source/core/frame/FrameSerializer.h
diff --git a/third_party/WebKit/Source/core/frame/FrameSerializer.h b/third_party/WebKit/Source/core/frame/FrameSerializer.h
index 0439d2e9beae7765fcf3e63b4fb578315f11e32c..199b8c0297a4d2914e6b28ac5b89335b2d6edf2a 100644
--- a/third_party/WebKit/Source/core/frame/FrameSerializer.h
+++ b/third_party/WebKit/Source/core/frame/FrameSerializer.h
@@ -89,6 +89,12 @@ class CORE_EXPORT FrameSerializer final {
 
     // 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