Expose RTF content on the clipboard as strings to pages when pasting.

third_party/WebKit/public/platform/WebClipboard.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
@@ skipping 59 matching lines @@
         Buffer, bool* containsFilenames) { return WebVector<WebString>(); }
     virtual WebString readPlainText(Buffer) { return WebString(); }
     // fragmentStart and fragmentEnd are indexes into the returned markup that
     // indicate the start and end of the fragment if the returned markup
     // contains additional context. If there is no additional context,
     // fragmentStart will be zero and fragmentEnd will be the same as the length
     // of the returned markup.
     virtual WebString readHTML(
         Buffer buffer, WebURL* pageURL, unsigned* fragmentStart,
         unsigned* fragmentEnd) { return WebString(); }
+    virtual WebString readRTF(Buffer) { return WebString(); }
     virtual WebBlobInfo readImage(Buffer) { return WebBlobInfo(); }
     virtual WebString readCustomData(
         Buffer, const WebString& type) { return WebString(); }
 
     virtual void writePlainText(const WebString&) { }
     virtual void writeHTML(
         const WebString& htmlText, const WebURL&,
         const WebString& plainText, bool writeSmartPaste) { }
     virtual void writeImage(
         const WebImage&, const WebURL&, const WebString& title) { }
     virtual void writeDataObject(const WebDragData&) { }
 
 protected:
     ~WebClipboard() { }
 };
 
 } // namespace blink
 
 #endif