[Media Router] Convert to use typemaps for media_router.mojom.

chrome/browser/media/router/media_sink.h

 // 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.
 
 #ifndef CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_H_
 #define CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_H_
 
 #include <string>
 
+#include "base/optional.h"
 #include "third_party/icu/source/common/unicode/uversion.h"
 
 namespace U_ICU_NAMESPACE {
 class Collator;
 }  // namespace U_ICU_NAMESPACE
 
 namespace media_router {
 
 // Represents a sink to which media can be routed.
 class MediaSink {
  public:
   using Id = std::string;
 
   // IconTypes are listed in the order in which sinks should be sorted.
   // The order must stay in sync with

[mark a. foltz, 2017/02/09 22:53:51]

Add a comment here about also updating struct_traits?

   // chrome/browser/resources/media_router/media_router_data.js.
   enum IconType {
     CAST,
     CAST_AUDIO_GROUP,
     CAST_AUDIO,
     HANGOUT,
     GENERIC
   };
 
   MediaSink(const MediaSink::Id& sink_id,
             const std::string& name,
             const IconType icon_type);
-
   MediaSink(const MediaSink& other);
+  MediaSink();
 
   ~MediaSink();
 
+  void set_sink_id(const MediaSink::Id& sink_id) { sink_id_ = sink_id; }
   const MediaSink::Id& id() const { return sink_id_; }
+
+  void set_name(const std::string& name) { name_ = name; }
   const std::string& name() const { return name_; }
+
   void set_description(const std::string& description) {
     description_ = description;
   }
-  const std::string& description() const { return description_; }
+  const base::Optional<std::string>& description() const {
+    return description_;
+  }
+
   void set_domain(const std::string& domain) { domain_ = domain; }
-  const std::string& domain() const { return domain_; }
+  const base::Optional<std::string>& domain() const { return domain_; }
+
+  void set_icon_type(IconType icon_type) { icon_type_ = icon_type; }
   IconType icon_type() const { return icon_type_; }
 
   bool Equals(const MediaSink& other) const;
 
   // Compares |this| to |other| first by their icon types, then their names
   // using |collator|, and finally their IDs.
   bool CompareUsingCollator(const MediaSink& other,
                             const icu::Collator* collator) const;
 
   // For storing in sets and in maps as keys.
   struct Compare {
     bool operator()(const MediaSink& sink1, const MediaSink& sink2) const {
       return sink1.id() < sink2.id();
     }
   };
 
  private:
   // Unique identifier for the MediaSink.
   MediaSink::Id sink_id_;
 
   // Descriptive name of the MediaSink.
   std::string name_;
 
   // Optional description of the MediaSink.
-  std::string description_;
+  base::Optional<std::string> description_;
 
   // Optional domain of the MediaSink.
-  std::string domain_;
+  base::Optional<std::string> domain_;
 
   // The type of icon that corresponds with the MediaSink.
-  IconType icon_type_;
+  IconType icon_type_ = IconType::GENERIC;
 };
 
 }  // namespace media_router
 
 #endif  // CHROME_BROWSER_MEDIA_ROUTER_MEDIA_SINK_H_