Add webusb notification UI code

components/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("//testing/test.gni")
 import("//tools/grit/repack.gni")
 
 # Collection of all components. You wouldn't link to this, but this is rather
@@ skipping 127 matching lines @@
     "//components/webdata/common",
     "//components/wifi",
     "//components/wifi_sync",
   ]
 
   if (!is_android && !is_ios) {
     deps += [
       "//components/audio_modem",
       "//components/proximity_auth",
       "//components/proximity_auth/cryptauth",
+      "//components/webusb",
     ]
   }
 
   if (!enable_configuration_policy) {
     deps -= [ "//components/policy" ]
   }
 
   if (!is_win && !is_mac) {
     deps -= [ "//components/wifi" ]
   }
@@ skipping 426 matching lines @@
 
   deps = [
     "//base",
     "//base/test:test_support_perf",
     "//testing/gtest",
     "//testing/perf",
     "//content/test:test_support",
     "//components/visitedlink/browser",
   ]
 }