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

mojo/mojo.gyp

Index: mojo/mojo.gyp
diff --git a/mojo/mojo.gyp b/mojo/mojo.gyp
index af6e853df4aa13b87db154d21def9c40c9850cf6..510075cec887691e259788224e63de1a2e426a74 100644
--- a/mojo/mojo.gyp
+++ b/mojo/mojo.gyp
@@ -65,6 +65,23 @@
       ]
     },
     {
+      'target_name': 'mojo_external_service_bindings',
+      'type': 'static_library',
+      'sources': [
+        'shell/external_service.mojom',
+      ],
+      'variables': {
+        'mojom_base_output_dir': 'mojo',
+      },
+      'includes': [ 'public/tools/bindings/mojom_bindings_generator.gypi' ],
+      'export_dependent_settings': [
+        'mojo_bindings',
+      ],
+      'dependencies': [
+        'mojo_bindings',
+      ],
+    },
+    {
       'target_name': 'mojo_run_all_unittests',
       'type': 'static_library',
       'dependencies': [
@@ -412,6 +429,7 @@
         '../base/base.gyp:base_static',
         '../net/net.gyp:net',
         '../url/url.gyp:url_lib',
+        'mojo_external_service_bindings',
         'mojo_gles2_impl',
         'mojo_service_manager',
         'mojo_shell_bindings',
@@ -463,6 +481,18 @@
         'shell/url_request_context_getter.cc',
         'shell/url_request_context_getter.h',
       ],
+      'conditions': [
+        ['OS=="linux"', {
+          'sources': [
+            'shell/dbus_service_loader.cc',

[DaveMoore, 2014/04/22 20:39:51]

It's more common in gyp files to list all files in the target and then exclude
them when not required. For OS dependent ones you can do that automatically
calling this dbux_service_loader_linux.{h,cc}. You would leave the extra
dependencies here though.

[Chris Masone, 2014/04/22 21:16:30]

Done.

+            'shell/dbus_service_loader.h',
+          ],
+          'dependencies': [
+            '../build/linux/system.gyp:dbus',
+            '../dbus/dbus.gyp:dbus',
+          ],
+        }],
+      ],
     },
     {
       'target_name': 'mojo_shell',