Add infrastructure for a USB device blocklist.

chrome/test/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/chrome_build.gni")
 import("//build/config/compiler/compiler.gni")
 import("//build/config/crypto.gni")
 import("//build/config/features.gni")
 import("//build/config/ui.gni")
 import("//chrome/common/features.gni")
@@ skipping 3690 matching lines @@
       "../browser/ui/webui/settings/settings_manage_profile_handler_unittest.cc",
       "../browser/ui/webui/settings/site_settings_handler_unittest.cc",
       "../browser/ui/webui/settings_utils_unittest.cc",
       "../browser/ui/webui/signin/login_ui_service_unittest.cc",
       "../browser/ui/webui/site_settings_helper_unittest.cc",
       "../browser/ui/webui/sync_internals_message_handler_unittest.cc",
       "../browser/ui/webui/web_dialog_web_contents_delegate_unittest.cc",
       "../browser/ui/window_sizer/window_sizer_common_unittest.cc",
       "../browser/ui/window_sizer/window_sizer_unittest.cc",
       "../browser/ui/zoom/zoom_controller_unittest.cc",
+      "../browser/usb/usb_blocklist_unittest.cc",
       "../browser/usb/usb_chooser_context_unittest.cc",
       "../browser/usb/usb_chooser_controller_unittest.cc",
       "../browser/usb/web_usb_detector_unittest.cc",
 
       # The importer code is not used on Android.
       "../common/importer/firefox_importer_utils_unittest.cc",
 
       # No service process (which also requires multiprocess lock).
       "../common/importer/mock_importer_bridge.cc",
       "../common/importer/mock_importer_bridge.h",
@@ skipping 1402 matching lines @@
 }
 
 if (is_win) {
   loadable_module("conflicts_dll") {
     testonly = true
     sources = [
       "conflicts/conflicts_dll.cc",
     ]
   }
 }