Make CUPS USB printing play better with the settings page. This change does several things:

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 1209 matching lines @@
     "printing/cups_print_job.cc",
     "printing/cups_print_job.h",
     "printing/cups_print_job_manager.cc",
     "printing/cups_print_job_manager.h",
     "printing/cups_print_job_manager_factory.cc",
     "printing/cups_print_job_manager_factory.h",
     "printing/cups_print_job_notification.cc",
     "printing/cups_print_job_notification.h",
     "printing/cups_print_job_notification_manager.cc",
     "printing/cups_print_job_notification_manager.h",
-    "printing/fake_printer_discoverer.cc",
-    "printing/fake_printer_discoverer.h",

[skau, 2017/03/31 17:50:11]

I know I told you to keep these, but can you delete them?  We can always
resurrect them from the git history. If they're not compiled, they'll just get
out of date anyway.

[Carlson, 2017/03/31 18:20:06]

Done.

     "printing/ppd_provider_factory.cc",
     "printing/ppd_provider_factory.h",
     "printing/printer_configurer.cc",
     "printing/printer_configurer.h",
+    "printing/printer_discoverer.cc",
     "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_printer_util.cc",
@@ skipping 568 matching lines @@
     "policy/proto/chrome_device_policy.proto",
     "policy/proto/install_attributes.proto",
   ]
 }
 
 proto_library("attestation_proto") {
   sources = [
     "attestation/attestation_key_payload.proto",
   ]
 }