Revert "Delete the Surfaces service."

examples/surfaces_app/child.mojom

Index: examples/surfaces_app/child.mojom
diff --git a/examples/surfaces_app/child.mojom b/examples/surfaces_app/child.mojom
new file mode 100644
index 0000000000000000000000000000000000000000..78392d070eabfc0efbdc2fae6462bccd27ba7840
--- /dev/null
+++ b/examples/surfaces_app/child.mojom
@@ -0,0 +1,13 @@
+// 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/services/geometry/interfaces/geometry.mojom";
+import "mojo/services/surfaces/interfaces/quads.mojom";
+import "mojo/services/surfaces/interfaces/surface_id.mojom";
+
+[ServiceName="Child"]
+interface Child {
+  ProduceFrame(mojo.Color color, mojo.Size size) =>
+      (mojo.SurfaceId id);
+};