Make sure ar_sample_app is actually built in the GN build.

remoting/BUILD.gn

 # Copyright 2015 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("//build/util/version.gni")
 import("//remoting/remoting_version.gni")
 import("//remoting/remoting_enable.gni")
 import("//testing/test.gni")
 
 # Various remoting targets need this version definition.
 config("version") {
   defines = [ "VERSION=$chrome_version_full" ]
 }
 
 group("remoting_all") {
   testonly = true
 
   deps = [
     #"//remoting:remoting_browser_test_resources",
     "//remoting:remoting_unittests",
+
     #"//remoting:remoting_webapp_unittests",
     #"//app_remoting_test.gyp:ar_sample_test_driver",
-    #"//app_remoting_webapp.gyp:ar_sample_app",
+    "//remoting/webapp:ar_sample_app",
   ]
 
   # TODO(GYP): add is_mac
   if ((is_linux && !is_chromeos) || is_win) {
     deps += [ "//remoting/webapp" ]
   }
 
   if (is_win) {
     deps += [
       #"//remoting:remoting_breakpad_tester",
@@ skipping 146 matching lines @@
 
       if (enable_webrtc) {
         deps += [ "//third_party/libjingle:libjingle_webrtc" ]
       }
     }
   }
 } else {
   group("remoting_unittests") {
   }
 }