Pass error messages from native messaging to web-app.

remoting/remoting_host_srcs.gypi

 # Copyright 2014 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': {
     'remoting_host_sources': [
       'host/audio_capturer.cc',
       'host/audio_capturer.h',
       'host/audio_capturer_linux.cc',
@@ skipping 280 matching lines @@
       'host/setup/pin_validator.cc',
       'host/setup/pin_validator.h',
       'host/setup/service_client.cc',
       'host/setup/service_client.h',
       'host/setup/test_util.cc',
       'host/setup/test_util.h',
       'host/setup/win/auth_code_getter.cc',
       'host/setup/win/auth_code_getter.h',
     ],
     'remoting_host_native_messaging_sources': [
+      'host/native_messaging/log_message_handler.cc',
+      'host/native_messaging/log_message_handler.h',
       'host/native_messaging/native_messaging_pipe.cc',
       'host/native_messaging/native_messaging_pipe.h',
       'host/native_messaging/native_messaging_reader.cc',
       'host/native_messaging/native_messaging_reader.h',
       'host/native_messaging/native_messaging_writer.cc',
       'host/native_messaging/native_messaging_writer.h',
       'host/native_messaging/pipe_messaging_channel.cc',
       'host/native_messaging/pipe_messaging_channel.h',
     ],
     'remoting_cast_sources': [
@@ skipping 10 matching lines @@
       'host/it2me/it2me_confirmation_dialog_chromeos.cc',
       'host/it2me/it2me_confirmation_dialog_proxy.cc',
       'host/it2me/it2me_confirmation_dialog_proxy.h',
       'host/it2me/it2me_host.cc',
       'host/it2me/it2me_host.h',
       'host/it2me/it2me_native_messaging_host.cc',
       'host/it2me/it2me_native_messaging_host.h',
     ],
   }
 }