[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/mock_device_description_service.cc

Index: chrome/browser/media/router/mock_device_description_service.cc
diff --git a/chrome/browser/media/router/mock_device_description_service.cc b/chrome/browser/media/router/mock_device_description_service.cc
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index 0000000000000000000000000000000000000000..19517d1279f3aa374e4e8630bbce6b9a5a708b8d
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+++ b/chrome/browser/media/router/mock_device_description_service.cc
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+// 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/mock_device_description_service.h"
+
+#include "chrome/browser/extensions/api/dial/dial_device_data.h"
+
+namespace media_router {
+
+MockDeviceDescriptionServiceObserver::MockDeviceDescriptionServiceObserver() {}
+MockDeviceDescriptionServiceObserver::~MockDeviceDescriptionServiceObserver() {}
+
+MockDeviceDescriptionService::MockDeviceDescriptionService(
+    DeviceDescriptionService::Observer* observer)
+    : DeviceDescriptionService(observer) {}
+MockDeviceDescriptionService::~MockDeviceDescriptionService() {}
+
+}  // namespace media_router