Implement Pepper proxy for PPB_DirectoryReader

ppapi/ppapi_proxy.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.
 
 {
   'target_defaults': {
     'variables': {
       'ppapi_proxy_target': 0,
     },
     'target_conditions': [
@@ skipping 14 matching lines @@
           'proxy/broker_dispatcher.h',
           'proxy/broker_resource.cc',
           'proxy/broker_resource.h',
           'proxy/browser_font_resource_trusted.cc',
           'proxy/browser_font_resource_trusted.h',
           'proxy/browser_font_singleton_resource.cc',
           'proxy/browser_font_singleton_resource.h',
           'proxy/connection.h',
           'proxy/device_enumeration_resource_helper.cc',
           'proxy/device_enumeration_resource_helper.h',
+          'proxy/directory_reader_resource.cc',
+          'proxy/directory_reader_resource.h',
           'proxy/dispatcher.cc',
           'proxy/dispatcher.h',
           'proxy/enter_proxy.h',
           'proxy/graphics_2d_resource.cc',
           'proxy/graphics_2d_resource.h',
           'proxy/file_chooser_resource.cc',
           'proxy/file_chooser_resource.h',
           'proxy/flash_clipboard_resource.cc',
           'proxy/flash_clipboard_resource.h',
           'proxy/flash_device_id_resource.cc',
@@ skipping 168 matching lines @@
               'proxy/serialized_flash_menu.cc',
               'proxy/talk_resource.cc',
               'proxy/video_capture_resource.cc',
             ],
           }],
         ],
       }],
     ],
   },
 }