[MR] Add description field to MediaSink.

chrome/browser/media/router/media_sink.cc

 // Copyright 2015 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/media_sink.h"
 
 namespace media_router {
 
 MediaSink::MediaSink(const MediaSink::Id& sink_id,
                      const std::string& name,
                      const MediaSink::IconType icon_type)
     : sink_id_(sink_id), name_(name), icon_type_(icon_type) {}

[apacible, 2015/11/25 23:05:41]

What happens if |sink_id| or |name| isn't provided?

[imcheng, 2015/12/01 19:29:27]

The assumption is that they will always be provided.

 
 MediaSink::~MediaSink() {
 }
 
 bool MediaSink::Equals(const MediaSink& other) const {
   return sink_id_ == other.sink_id_;
 }
 
-bool MediaSink::Empty() const {
-  return sink_id_.empty();
-}
-
 }  // namespace media_router