Adds ability for chrome to behave as mojo_runner

chrome/package_mash_services.gni

Index: chrome/package_mash_services.gni
diff --git a/chrome/package_mash_services.gni b/chrome/package_mash_services.gni
new file mode 100644
index 0000000000000000000000000000000000000000..2edbcdd2813a37eaff5e8feabb3120d6b14006a3
--- /dev/null
+++ b/chrome/package_mash_services.gni
@@ -0,0 +1,9 @@
+# Copyright 2016 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.
+
+declare_args() {
+  # Set to true to bundle all the mash related mojo services into chrome.
+  # Specify --mash to chrome to have chrome start the mash environment.
+  enable_package_mash_services = is_chromeos
+}