Use a JS markup serializer.

sky/engine/public/web/WebFrame.h

 /*
  * Copyright (C) 2009 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
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     // Returns the contents of this frame as a string.  If the text is
     // longer than maxChars, it will be clipped to that length.  WARNING:
     // This function may be slow depending on the number of characters
     // retrieved and page complexity.  For a typically sized page, expect
     // it to take on the order of milliseconds.
     //
     // If there is room, subframe text will be recursively appended. Each
     // frame will be separated by an empty line.
     virtual WebString contentAsText(size_t maxChars) const = 0;
 
-    // Returns HTML text for the contents of this frame.  This is generated
-    // from the DOM.
-    virtual WebString contentAsMarkup() const = 0;
-
     // Returns a text representation of the render tree.  This method is used
     // to support layout tests.
     virtual WebString renderTreeAsText(RenderAsTextControls toShow = RenderAsTextNormal) const = 0;
 
     // Calls markerTextForListItem() defined in WebCore/rendering/RenderTreeAsText.h.
     virtual WebString markerTextForListItem(const WebElement&) const = 0;
 
     // Returns the bounds rect for current selection. If selection is performed
     // on transformed text, the rect will still bound the selection but will
     // not be transformed itself. If no selection is present, the rect will be
@@ skipping 15 matching lines @@
 private:
 };
 
 #if BLINK_IMPLEMENTATION
 Frame* toCoreFrame(const WebFrame*);
 #endif
 
 } // namespace blink
 
 #endif  // SKY_ENGINE_PUBLIC_WEB_WEBFRAME_H_