Add an end-to-end test that excercises Mojo with a sandbox.

content/shell/utility/shell_content_utility_client.cc

Index: content/shell/utility/shell_content_utility_client.cc
diff --git a/content/shell/utility/shell_content_utility_client.cc b/content/shell/utility/shell_content_utility_client.cc
index 0acf82954e1e10cee3cb71a22ad063c8f6be3f7c..407c19742b76e615a648a716b83b91c1ff73aaba 100644
--- a/content/shell/utility/shell_content_utility_client.cc
+++ b/content/shell/utility/shell_content_utility_client.cc
@@ -7,7 +7,9 @@
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "content/common/mojo/static_loader.h"
+#include "content/public/common/service_registry.h"
 #include "content/public/test/test_mojo_app.h"
+#include "content/shell/utility/mojo_test_impl.h"
 
 namespace content {
 
@@ -27,4 +29,10 @@ void ShellContentUtilityClient::RegisterMojoApplications(
   apps->insert(std::make_pair(kTestMojoAppUrl, base::Bind(&CreateTestApp)));
 }
 
+void ShellContentUtilityClient::RegisterMojoServices(
+    ServiceRegistry* registry) {
+  registry->AddService<mojom::MojoTest>(
+      base::Bind(&MojoTestImpl::CreateMojoTestImpl));
+}
+
 }  // namespace content