Add a service to track devices selected by the user.

apps/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")
 
 static_library("apps") {
   sources = [
     "app_lifetime_monitor.cc",
     "app_lifetime_monitor.h",
     "app_lifetime_monitor_factory.cc",
     "app_lifetime_monitor_factory.h",
     "app_load_service.cc",
     "app_load_service.h",
     "app_load_service_factory.cc",
     "app_load_service_factory.h",
     "app_restore_service.cc",
     "app_restore_service.h",
     "app_restore_service_factory.cc",
     "app_restore_service_factory.h",
     "browser_context_keyed_service_factories.cc",
     "browser_context_keyed_service_factories.h",
     "custom_launcher_page_contents.cc",
     "custom_launcher_page_contents.h",
     "launcher.cc",
     "launcher.h",
     "metrics_names.h",
+    "saved_devices_service.cc",
+    "saved_devices_service.h",
+    "saved_devices_service_factory.cc",
+    "saved_devices_service_factory.h",
     "saved_files_service.cc",
     "saved_files_service.h",
     "saved_files_service_factory.cc",
     "saved_files_service_factory.h",
     "switches.cc",
     "switches.h",
   ]
 
   configs += [ "//build/config/compiler:wexit_time_destructors" ]
 
   deps = [
     "//chrome/app/theme:theme_resources",
     "//chrome/browser/extensions",
     "//chrome/common/extensions/api:api",
     "//components/web_modal",
+    "//device/usb",
     "//skia",
   ]
 
   if (is_chromeos) {
     #deps += [ "browser_chromeos" ]  TODO(GYP)
   }
 
   if (!enable_extensions) {
     # When extensions are disabled, only the sizer file below is included.
     deps -= [ "//chrome/browser/extensions" ]
@@ skipping 11 matching lines @@
       "//ui/strings",
       "//ui/views",
     ]
   }
 
   if (is_win) {
     # TODO(jschuh): crbug.com/167187 fix size_t to int truncations.
     cflags = [ "/wd4267" ]
   }
 }