Implement basic USB setup in the cups printer detector. Factor out

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("//extensions/features/features.gni")
 import("//media/media_options.gni")
 import("//printing/features/features.gni")
 import("//third_party/protobuf/proto_library.gni")
@@ skipping 1207 matching lines @@
     "printing/printer_configurer.h",
     "printing/printer_discoverer.h",
     "printing/printers_manager.cc",
     "printing/printers_manager.h",
     "printing/printers_manager_factory.cc",
     "printing/printers_manager_factory.h",
     "printing/printers_sync_bridge.cc",
     "printing/printers_sync_bridge.h",
     "printing/specifics_translation.cc",
     "printing/specifics_translation.h",
+    "printing/usb_util.cc",
+    "printing/usb_util.h",
     "profiles/avatar_menu_actions_chromeos.cc",
     "profiles/avatar_menu_actions_chromeos.h",
     "profiles/avatar_menu_chromeos.cc",
     "profiles/multiprofiles_intro_dialog.cc",
     "profiles/multiprofiles_intro_dialog.h",
     "profiles/multiprofiles_session_aborted_dialog.cc",
     "profiles/multiprofiles_session_aborted_dialog.h",
     "profiles/profile_helper.cc",
     "profiles/profile_helper.h",
     "profiles/profile_list_chromeos.cc",
@@ skipping 559 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }