[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/discovery/dial/mock_device_description_service.cc

Index: chrome/browser/media/router/discovery/dial/mock_device_description_service.cc
diff --git a/chrome/browser/media/router/discovery/dial/mock_device_description_service.cc b/chrome/browser/media/router/discovery/dial/mock_device_description_service.cc
new file mode 100644
index 0000000000000000000000000000000000000000..8857e66fc7542d7c8c27fe963af33b9254afcb56
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+++ b/chrome/browser/media/router/discovery/dial/mock_device_description_service.cc
@@ -0,0 +1,17 @@
+// 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.
+
+#include "chrome/browser/media/router/discovery/dial/mock_device_description_service.h"
+
+#include "chrome/browser/media/router/discovery/dial/dial_device_data.h"
+
+namespace media_router {
+
+MockDeviceDescriptionService::MockDeviceDescriptionService(
+    DeviceDescriptionParseSuccessCallback success_cb,
+    DeviceDescriptionParseErrorCallback error_cb)
+    : DeviceDescriptionService(success_cb, error_cb) {}
+MockDeviceDescriptionService::~MockDeviceDescriptionService() {}
+
+}  // namespace media_router