[Media Router] Add MediaSink subtypes

chrome/browser/media/router/dial_media_sink.h

+// 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.
+
+#ifndef CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_H_
+#define CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_H_
+
+#include "chrome/browser/media/router/media_sink.h"
+#include "url/gurl.h"
+
+namespace media_router {
+
+// Represents a dial sink to which media can be routed.
+class DialMediaSink : public MediaSink {
+ public:
+  DialMediaSink(const MediaSink::Id& sink_id,
+                const std::string& name,
+                const IconType icon_type);
+  DialMediaSink(const DialMediaSink& other);
+  ~DialMediaSink();
+
+  const std::string& ip_address() const { return ip_address_; }
+  void set_ip_address(const std::string& ip_address) {
+    ip_address_ = ip_address;
+  }
+  const GURL& app_url() const { return app_url_; }
+  void set_app_url(const GURL& app_url) { app_url_ = app_url; }
+
+  // Used by mojo.
+  static const DialMediaSink* Cast(const MediaSink* sink);
+  static DialMediaSink* Cast(MediaSink* sink);
+
+ private:
+  // Used for feedback

[imcheng, 2017/02/08 01:28:08]

Not needed.

[zhaobin, 2017/02/09 00:13:52]

Done.

+  std::string ip_address_;
+
+  // Used for DIAL launch

[imcheng, 2017/02/08 01:28:08]

I would probably write this as:

// The base URL used for DIAL operations.

[zhaobin, 2017/02/09 00:13:52]

Done.

+  GURL app_url_;
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_BROWSER_MEDIA_ROUTER_DIAL_MEDIA_SINK_H_