Add GetSequenceNumber function to PPB_Flash_Clipboard

chrome/browser/renderer_host/pepper/pepper_flash_clipboard_message_filter.h

 // Copyright (c) 2012 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.
 
 #ifndef CHROME_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FLASH_CLIPBOARD_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FLASH_CLIPBOARD_MESSAGE_FILTER_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 43 matching lines @@
   int32_t OnMsgIsFormatAvailable(ppapi::host::HostMessageContext* host_context,
                                  uint32_t clipboard_type,
                                  uint32_t format);
   int32_t OnMsgReadData(ppapi::host::HostMessageContext* host_context,
                         uint32_t clipoard_type,
                         uint32_t format);
   int32_t OnMsgWriteData(ppapi::host::HostMessageContext* host_context,
                          uint32_t clipboard_type,
                          const std::vector<uint32_t>& formats,
                          const std::vector<std::string>& data);
+  int32_t OnMsgGetSequenceNumber(ppapi::host::HostMessageContext* host_context,
+                                 uint32_t clipboard_type);
 
   int32_t WriteClipboardDataItem(uint32_t format,
                                  const std::string& data,
                                  ui::ScopedClipboardWriter* scw);
 
   ppapi::FlashClipboardFormatRegistry custom_formats_;
 
   DISALLOW_COPY_AND_ASSIGN(PepperFlashClipboardMessageFilter);
 };
 
 }  // namespace chrome
 
 #endif  // CHROME_BROWSER_RENDERER_HOST_PEPPER_PEPPER_FLASH_CLIPBOARD_MESSAGE_FILTER_H_