Pepper/Flapper: Add C++ wrappers for PPB_Flash_Clipboard.

ppapi/ppapi_sources.gypi

 # 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.
 
 {
   'variables': {
     'c_source_files': [
       'c/pp_bool.h',
       'c/pp_completion_callback.h',
       'c/pp_errors.h',
@@ skipping 211 matching lines @@
       'cpp/dev/zoom_dev.cc',
       'cpp/dev/zoom_dev.h',
 
       # Deprecated interfaces.
       'cpp/dev/scriptable_object_deprecated.h',
       'cpp/dev/scriptable_object_deprecated.cc',
 
       # Private interfaces.
       'cpp/private/flash.cc',
       'cpp/private/flash.h',
+      'cpp/private/flash_clipboard.cc',
+      'cpp/private/flash_clipboard.h',
       'cpp/private/flash_fullscreen.cc',
       'cpp/private/flash_fullscreen.h',
       'cpp/private/flash_menu.cc',
       'cpp/private/flash_menu.h',
       'cpp/private/flash_net_connector.cc',
       'cpp/private/flash_net_connector.h',
       'cpp/private/instance_private.cc',
       'cpp/private/instance_private.h',
       'cpp/private/net_address_private.cc',
       'cpp/private/net_address_private.h',
@@ skipping 161 matching lines @@
           'c/dev/ppb_transport_dev.h',
         ],
         'cpp_source_files': [
           'cpp/dev/transport_dev.cc',
           'cpp/dev/transport_dev.h',
         ],
       },
     }],
   ],
 }