Add glue for supporting custom MIME types in DataTransfer.

content/browser/renderer_host/clipboard_message_filter.h

Index: content/browser/renderer_host/clipboard_message_filter.h
diff --git a/content/browser/renderer_host/clipboard_message_filter.h b/content/browser/renderer_host/clipboard_message_filter.h
index b4f24bbe93436b23a2cc52b0b113658a69063793..28ac13a7146843712fc7b80f5831c0a4081e9d34 100644
--- a/content/browser/renderer_host/clipboard_message_filter.h
+++ b/content/browser/renderer_host/clipboard_message_filter.h
@@ -44,6 +44,9 @@ class ClipboardMessageFilter : public BrowserMessageFilter {
                   uint32* fragment_start, uint32* fragment_end);
   void OnReadImage(ui::Clipboard::Buffer buffer, IPC::Message* reply_msg);
   void OnReadImageReply(const SkBitmap& bitmap, IPC::Message* reply_msg);
+  void OnReadCustomData(ui::Clipboard::Buffer buffer,
+                        const string16& type,
+                        string16* data);

[tony, 2011/12/02 00:13:29]

Nit: The other messages seem to use |result| rather than |data|.

[dcheng, 2011/12/02 00:29:17]

Done.

 #if defined(OS_MACOSX)
   void OnFindPboardWriteString(const string16& text);
 #endif