Implement event sender service for testing

sky/viewer/services/test_harness.mojom

Index: sky/viewer/services/test_harness.mojom
diff --git a/sky/viewer/services/test_harness.mojom b/sky/viewer/services/test_harness.mojom
deleted file mode 100644
index 586f61946ccb5b9adc2475bc7b72ddb58f412edb..0000000000000000000000000000000000000000
--- a/sky/viewer/services/test_harness.mojom
+++ /dev/null
@@ -1,12 +0,0 @@
-// Copyright 2014 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.
-
-module sky;
-
-import "mojo/services/public/interfaces/input_events/input_events.mojom";
-
-interface TestHarness {
-  OnTestComplete(string test_result);
-  DispatchInputEvent(mojo.Event event);
-};