Add glue for supporting custom MIME types in DataTransfer.

webkit/tools/test_shell/simple_clipboard_impl.cc

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "webkit/tools/test_shell/simple_clipboard_impl.h"
 
 #include <string>
 
 #include "base/lazy_instance.h"
 #include "base/stl_util.h"
@@ skipping 76 matching lines @@
           bitmap.rowBytes(),
           false,
           std::vector<gfx::PNGCodec::Comment>(),
           Z_BEST_SPEED,
           &png_data)) {
     data->assign(reinterpret_cast<char*>(vector_as_array(&png_data)),
                  png_data.size());
   }
 }
 
+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;
 }
-