arc-bridge: Enable ARC with a command-line flag

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")
 
 if (is_android) {
@@ skipping 74 matching lines @@
     "//components/version_info",
     "//components/version_ui",
     "//components/web_resource",
     "//components/webdata_services",
   ]
 
   if (!is_ios) {
     deps += [
       "//components/about_handler",
       "//components/app_modal",
+      "//components/arc",
       "//components/auto_login_parser",
       "//components/autofill/content/browser",
       "//components/autofill/content/common",
       "//components/autofill/content/renderer",
       "//components/bitmap_uploader",
       "//components/browsing_data",
       "//components/bubble",
       "//components/captive_portal",
       "//components/cdm/browser",
       "//components/cdm/browser",
@@ skipping 113 matching lines @@
         "//components/webusb",
       ]
     }
 
     if (!is_win && !is_mac) {
       deps -= [ "//components/wifi" ]
     }
 
     if (!is_chromeos) {
       deps -= [
+        "//components/arc",
         "//components/pairing",
         "//components/wifi_sync",
       ]
     }
 
-    if (is_chromeos && enable_arc) {
-      deps += [ "//components/arc" ]
-    }
-
     if (!use_ash) {
       deps -= [ "//components/exo" ]
     }
 
     if (!use_ash || !is_linux) {
       deps -= [ "//components/exo/wayland" ]
     }
   } else {
     deps += [
       "//components/autofill/ios/browser",
@@ skipping 258 matching lines @@
         "//components/variations/android:variations_java",
         "//content/public/android:content_java",
         "//ui/android:ui_java",
       ]
 
       if (enable_configuration_policy) {
         apk_deps += [ "//components/policy/android:policy_java" ]
       }
     }
     if (is_chromeos) {
-      deps += [ "//components/ownership:unit_tests" ]
-    }
-    if (is_chromeos && enable_arc) {
-      deps += [ "//components/arc:unit_tests" ]
+      deps += [
+        "//components/arc:unit_tests",
+        "//components/ownership:unit_tests",
+      ]
     }
 
     # TODO(GYP) need this target.
     #'breakpad/app/crash_keys_win_unittest.cc',
 
     if (enable_configuration_policy) {
       deps += [
         "//components/policy/core/browser:unit_tests",
         "//components/policy/core/common:unit_tests",
       ]
@@ skipping 198 matching lines @@
   ]
   if (!is_ios) {
     deps += [
       "//base",
       "//base/test:test_support_perf",
       "//components/visitedlink/browser",
       "//content/test:test_support",
     ]
   }
 }