mojo: add some end-to-end shell tests and a new test sample app

mojo/services/test_service/test_service_application.cc

Index: mojo/services/test_service/test_service_application.cc
diff --git a/mojo/services/test_service/test_service_application.cc b/mojo/services/test_service/test_service_application.cc
index 5b649739b5e44f8fabcbd14ba17b74b059caeee1..097f368bc6593e45abeae8c594b9e0a23f669738 100644
--- a/mojo/services/test_service/test_service_application.cc
+++ b/mojo/services/test_service/test_service_application.cc
@@ -9,6 +9,7 @@
 #include "mojo/public/cpp/application/application_connection.h"
 #include "mojo/public/cpp/utility/run_loop.h"
 #include "mojo/services/test_service/test_service_impl.h"
+#include "mojo/services/test_service/test_time_service_impl.h"
 
 namespace mojo {
 namespace test {
@@ -22,6 +23,7 @@ TestServiceApplication::~TestServiceApplication() {
 bool TestServiceApplication::ConfigureIncomingConnection(
     ApplicationConnection* connection) {
   connection->AddService<TestServiceImpl>(this);
+  connection->AddService<TestTimeServiceImpl>();
   return true;
 }