Add GetSequenceNumber function to PPB_Flash_Clipboard

ppapi/proxy/flash_clipboard_resource.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 PPAPI_PROXY_FLASH_CLIPBOARD_RESOURCE_H_
 #define PPAPI_PROXY_FLASH_CLIPBOARD_RESOURCE_H_
 
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource.h"
 #include "ppapi/shared_impl/flash_clipboard_format_registry.h"
@@ skipping 19 matching lines @@
                                     PP_Flash_Clipboard_Type clipboard_type,
                                     uint32_t format) OVERRIDE;
   virtual PP_Var ReadData(PP_Instance instance,
                           PP_Flash_Clipboard_Type clipboard_type,
                           uint32_t format) OVERRIDE;
   virtual int32_t WriteData(PP_Instance instance,
                             PP_Flash_Clipboard_Type clipboard_type,
                             uint32_t data_item_count,
                             const uint32_t formats[],
                             const PP_Var data_items[]) OVERRIDE;
+  virtual PP_Bool GetSequenceNumber(
+      PP_Instance instance,
+      PP_Flash_Clipboard_Type clipboard_type,
+      uint64_t* sequence_number) OVERRIDE;
 
  private:
   FlashClipboardFormatRegistry clipboard_formats_;
 
   DISALLOW_COPY_AND_ASSIGN(FlashClipboardResource);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif  // PPAPI_PROXY_FLASH_CLIPBOARD_RESOURCE_H_