Implement a trivial Mojo EchoService that can be connected to over DBus

mojo/mojo_examples.gypi

 # Copyright 2013 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.
 
 {
   'targets': [
     {
       'target_name': 'mojo_sample_app',
       'type': 'shared_library',
       'dependencies': [
@@ skipping 301 matching lines @@
         },
         {
           'target_name': 'package_mojo_view_manager',
           'variables': {
             'app_name': 'mojo_view_manager',
           },
           'includes': [ 'build/package_app.gypi' ],
         },
       ],
     }],
+    ['OS=="linux"', {
+      'targets': [
+        {
+          'target_name': 'mojo_dbus_echo',
+          'type': 'shared_library',
+          'dependencies': [
+            '../base/base.gyp:base',
+            'mojo_bindings',
+            'mojo_environment_standalone',
+            'mojo_echo_bindings',
+            'mojo_shell_client',
+            'mojo_system',
+            'mojo_utility',
+          ],
+          'sources': [
+            'examples/dbus_echo/dbus_echo_app.cc',
+          ],
+        },
+      ],
+    }],
   ],
 }