Add Chromium environment application test support.

examples/apptest/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("//mojo/public/tools/bindings/mojom.gni")
 
 group("apptest") {
   testonly = true
 
   deps = [
@@ skipping 30 matching lines @@
     "example_client_application.cc",
     "example_client_application.h",
     "example_client_impl.cc",
     "example_client_impl.h",
   ]
 
    deps = [
     ":bindings",
     "//mojo/public/c/system:for_shared_library",
     "//mojo/public/cpp/application:standalone",
-    "//mojo/public/cpp/application:test_support",
+    "//mojo/public/cpp/application:test_support_standalone",
    ]
 
    datadeps = [ ":service", ]
 }
 
 mojom("bindings") {
   sources = [ "example_service.mojom" ]
 }