Add GetSequenceNumber function to PPB_Flash_Clipboard

ppapi/proxy/flash_clipboard_resource.cc

 // 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.
 
 #include "ppapi/proxy/flash_clipboard_resource.h"
 
 #include "ipc/ipc_message.h"
 #include "ppapi/c/pp_errors.h"
 #include "ppapi/proxy/ppapi_messages.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
@@ skipping 134 matching lines @@
   Post(BROWSER,
        PpapiHostMsg_FlashClipboard_WriteData(
            static_cast<uint32_t>(clipboard_type),
            formats_vector,
            data_items_vector));
 
   // Assume success, since it allows us to avoid a sync IPC.
   return PP_OK;
 }
 
+PP_Bool FlashClipboardResource::GetSequenceNumber(
+    PP_Instance instance,
+    PP_Flash_Clipboard_Type clipboard_type,
+    uint64_t* sequence_number) {
+  int32_t result =
+      SyncCall<PpapiPluginMsg_FlashClipboard_GetSequenceNumberReply>(
+          BROWSER,
+          PpapiHostMsg_FlashClipboard_GetSequenceNumber(clipboard_type),
+          sequence_number);
+  return PP_FromBool(result == PP_OK);
+}
+
 }  // namespace proxy
 }  // namespace ppapi