Add glue for supporting custom MIME types in DataTransfer.

webkit/tools/test_shell/simple_clipboard_impl.cc

Index: webkit/tools/test_shell/simple_clipboard_impl.cc
diff --git a/webkit/tools/test_shell/simple_clipboard_impl.cc b/webkit/tools/test_shell/simple_clipboard_impl.cc
index 0b137f1caf14bf30056dca5408d46cbbd2102882..c7bb959cb98dda1e3284b4b74ed8d09553a020b2 100644
--- a/webkit/tools/test_shell/simple_clipboard_impl.cc
+++ b/webkit/tools/test_shell/simple_clipboard_impl.cc
@@ -94,8 +94,13 @@ void SimpleClipboardClient::ReadImage(ui::Clipboard::Buffer buffer,
   }
 }
 
+void SimpleClipboardClient::ReadCustomData(ui::Clipboard::Buffer buffer,
+                                           const string16& type,
+                                           string16* data) {
+  GetClipboard()->ReadCustomData(buffer, type, data);
+}
+
 webkit_glue::ClipboardClient::WriteContext*
 SimpleClipboardClient::CreateWriteContext() {
   return NULL;
 }
-