Make the file chooser use PP_ArrayOutput

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.
 
 {
   'targets': [
     {
       'target_name': 'ppapi_proxy',
       'type': '<(component)',
       'dependencies': [
@@ skipping 10 matching lines @@
       'all_dependent_settings': {
         'include_dirs': [
            '..',
         ],
       },
       'include_dirs': [
         '..',
         '../..',  # For nacl includes to work.
       ],
       'sources': [
+        # Take some standalong files from the C++ wrapper allowing us to more
+        # easily make async callbacks in the proxy. We can't depend on the
+        # full C++ wrappers at this layer since the C++ wrappers expect
+        # symbols defining the globals for "being a plugin" which we are not.
+        # These callback files are standalone.
+        'cpp/completion_callback.cc',
+        'cpp/completion_callback.h',
+        'utility/completion_callback_factory.h',
+
         'proxy/broker_dispatcher.cc',
         'proxy/broker_dispatcher.h',
         'proxy/dispatcher.cc',
         'proxy/dispatcher.h',
         'proxy/enter_proxy.h',
         'proxy/host_dispatcher.cc',
         'proxy/host_dispatcher.h',
         'proxy/host_var_serialization_rules.cc',
         'proxy/host_var_serialization_rules.h',
         'proxy/interface_list.cc',
@@ skipping 99 matching lines @@
         'proxy/ppp_messaging_proxy.cc',
         'proxy/ppp_messaging_proxy.h',
         'proxy/ppp_mouse_lock_proxy.cc',
         'proxy/ppp_mouse_lock_proxy.h',
         'proxy/ppp_printing_proxy.cc',
         'proxy/ppp_printing_proxy.h',
         'proxy/ppp_text_input_proxy.cc',
         'proxy/ppp_text_input_proxy.h',
         'proxy/ppp_video_decoder_proxy.cc',
         'proxy/ppp_video_decoder_proxy.h',
+        'proxy/proxy_array_output.cc',
+        'proxy/proxy_array_output.h',
         'proxy/proxy_channel.cc',
         'proxy/proxy_channel.h',
         'proxy/proxy_module.cc',
         'proxy/proxy_module.h',
         'proxy/proxy_object_var.cc',
         'proxy/proxy_object_var.h',
         'proxy/resource_creation_proxy.cc',
         'proxy/resource_creation_proxy.h',
         'proxy/serialized_flash_menu.cc',
         'proxy/serialized_flash_menu.h',
         'proxy/serialized_structs.cc',
         'proxy/serialized_structs.h',
         'proxy/serialized_var.cc',
         'proxy/serialized_var.h',
         'proxy/var_serialization_rules.h',
       ],
       'defines': [
         'PPAPI_PROXY_IMPLEMENTATION',
       ],
     },
   ],
 }