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

third_party/WebKit/public/platform/WebClipboard.h

Index: third_party/WebKit/public/platform/WebClipboard.h
diff --git a/third_party/WebKit/public/platform/WebClipboard.h b/third_party/WebKit/public/platform/WebClipboard.h
index e1b76133de088599302225d1707c87484dce3434..96230b1f80ac190ab4e509ad55ac521ce097047e 100644
--- a/third_party/WebKit/public/platform/WebClipboard.h
+++ b/third_party/WebKit/public/platform/WebClipboard.h
@@ -77,6 +77,7 @@ public:
     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(); }