Update from https://crrev.com/312398

services/window_manager/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/ui.gni")
 import("//mojo/public/mojo_application.gni")
+import("//testing/test.gni")
 
 mojo_native_application("window_manager") {
   sources = [
     "main.cc",
   ]
 
   public_deps = [
     ":lib",
   ]
 
@@ skipping 100 matching lines @@
     "//mojo/public/c/system:for_shared_library",
     "//mojo/public/cpp/system:system",
     "//mojo/services/view_manager/public/cpp",
     "//mojo/services/window_manager/public/interfaces",
   ]
 
   datadeps = [
     ":window_manager",
   ]
 }