arc-bridge: Add IPC message definitions

chromeos/chromeos.gyp

 # 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': {
     'chromium_code': 1,
     # These files lists are shared with the GN build.
     'chromeos_sources': [
       'accelerometer/accelerometer_reader.cc',
       'accelerometer/accelerometer_reader.h',
       'accelerometer/accelerometer_types.cc',
       'accelerometer/accelerometer_types.h',
       'app_mode/kiosk_oem_manifest_parser.cc',
       'app_mode/kiosk_oem_manifest_parser.h',
+      'arc/bridge/common/arc_message_generator.cc',
       'attestation/attestation_constants.cc',
       'attestation/attestation_constants.h',
       'attestation/attestation_flow.cc',
       'attestation/attestation_flow.h',
       'audio/audio_device.cc',
       'audio/audio_device.h',
       'audio/audio_devices_pref_handler.h',
       'audio/audio_devices_pref_handler_impl.cc',
       'audio/audio_devices_pref_handler_impl.h',
       'audio/audio_devices_pref_handler_stub.cc',
@@ skipping 733 matching lines @@
             '../build/isolate.gypi',
           ],
           'sources': [
             'chromeos_unittests.isolate',
           ],
         },
       ],
     }],
   ],
 }