Introduced support for external services registration in the ServiceProtocol

observatory_sources.gypi

Index: observatory_sources.gypi
diff --git a/observatory_sources.gypi b/observatory_sources.gypi
new file mode 100644
index 0000000000000000000000000000000000000000..29928d04edd4b8d8d6663015e680076ad24f6e30
--- /dev/null
+++ b/observatory_sources.gypi
@@ -0,0 +1,9 @@
+# Copyright (c) 2017, the Dart project authors.  Please see the AUTHORS file
+# for details. All rights reserved. Use of this source code is governed by a
+# BSD-style license that can be found in the LICENSE file.
+
+# This file contains all dart, css, and html sources for Observatory.
+{
+  'sources': [
+  ]
+}