Add glue for supporting custom MIME types in DataTransfer.

content/renderer/renderer_clipboard_client.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.
 
 // This file provides the embedder's side of random webkit glue functions.
 
 #include "content/renderer/renderer_clipboard_client.h"
 
 #include "build/build_config.h"
 
@@ skipping 151 matching lines @@
   uint32 image_size;
   RenderThreadImpl::current()->Send(
       new ClipboardHostMsg_ReadImage(buffer, &image_handle, &image_size));
   if (base::SharedMemory::IsHandleValid(image_handle)) {
     base::SharedMemory buffer(image_handle, true);
     buffer.Map(image_size);
     data->append(static_cast<char*>(buffer.memory()), image_size);
   }
 }
 
+void RendererClipboardClient::ReadCustomData(ui::Clipboard::Buffer buffer,
+                                             const string16& type,
+                                             string16* data) {
+  RenderThreadImpl::current()->Send(
+      new ClipboardHostMsg_ReadCustomData(buffer, type, data));
+}
+
 webkit_glue::ClipboardClient::WriteContext*
 RendererClipboardClient::CreateWriteContext() {
   return new RendererClipboardWriteContext;
 }