Move display_service_unittests to services_unittests.

services/service_manager/public/tools/test/service_test.gni

 # Copyright 2017 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.
 
 import("//services/catalog/public/tools/catalog.gni")
 import("//testing/test.gni")
 
 # Generates a unittest binary with a baked-in Service Manager catalog manifest.
 #
 # Parameters:
 #
 #   catalog
 #       The catalog target whose output should be used as the static catalog
 #       manifest for this test binary.
 #
 template("service_test") {
   assert(defined(invoker.catalog), "service_test must specify a catalog")
 
   catalog_source_target = "${target_name}__catalog_source"
 
   test(target_name) {
-    forward_variables_from(invoker, "*", [ "catalog" ])
+    forward_variables_from(invoker,
+                           "*",
+                           [
+                             "catalog",
+                             "test_runner",
+                           ])
 
     if (!defined(deps)) {
       deps = []
     }
-    deps += [
-      ":$catalog_source_target",
-      "//services/service_manager/public/cpp/test:run_all_service_tests",
-    ]
+    deps += [ ":$catalog_source_target" ]
+    if (defined(invoker.test_runner)) {
+      deps += [ invoker.test_runner ]
+    } else {
+      deps +=
+          [ "//services/service_manager/public/cpp/test:run_all_service_tests" ]
+    }
   }
 
   catalog_cpp_source(catalog_source_target) {
     testonly = true
     catalog = invoker.catalog
     generated_function_name = "service_manager::test::CreateTestCatalog"
   }
 }