Adding domain and facade supporting classes for remoting iOS app.

remoting/client/ios/domain/BUILD.gn

Index: remoting/client/ios/domain/BUILD.gn
diff --git a/remoting/client/ios/domain/BUILD.gn b/remoting/client/ios/domain/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..3bb45b4cdd4d60c67523c81c73b53768603f1d2a
--- /dev/null
+++ b/remoting/client/ios/domain/BUILD.gn
@@ -0,0 +1,18 @@
+# Copyright 2017 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/chrome_build.gni")
+import("//build/config/ios/rules.gni")
+import("//remoting/build/config/remoting_build.gni")
+
+source_set("domain") {
+  sources = [
+    "host.h",
+    "host.mm",
+    "user.h",
+    "user.mm",
+  ]
+
+  configs += [ "//build/config/compiler:enable_arc" ]
+}