Extract ArcSupportMessageHost.

chrome/browser/chromeos/BUILD.gn

 # 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.
 
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//media/media_options.gni")
 import("//third_party/protobuf/proto_library.gni")
 
 assert(is_chromeos)
@@ skipping 227 matching lines @@
     "arc/arc_wallpaper_service.cc",
     "arc/arc_wallpaper_service.h",
     "arc/fileapi/arc_content_file_system_async_file_util.cc",
     "arc/fileapi/arc_content_file_system_async_file_util.h",
     "arc/fileapi/arc_content_file_system_backend_delegate.cc",
     "arc/fileapi/arc_content_file_system_backend_delegate.h",
     "arc/fileapi/arc_content_file_system_file_stream_reader.cc",
     "arc/fileapi/arc_content_file_system_file_stream_reader.h",
     "arc/gpu_arc_video_service_host.cc",
     "arc/gpu_arc_video_service_host.h",
+    "arc/ui/arc_support_message_host.cc",
+    "arc/ui/arc_support_message_host.h",
     "attestation/attestation_ca_client.cc",
     "attestation/attestation_ca_client.h",
     "attestation/attestation_policy_observer.cc",
     "attestation/attestation_policy_observer.h",
     "attestation/platform_verification_dialog.cc",
     "attestation/platform_verification_dialog.h",
     "attestation/platform_verification_flow.cc",
     "attestation/platform_verification_flow.h",
     "attestation/platform_verification_impl.cc",
     "attestation/platform_verification_impl.h",
@@ skipping 1353 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }