[Media Router] Add DialMediaSinkService and DeviceDescriptionService

chrome/browser/media/router/discovery/media_sink_internal.h

Index: chrome/browser/media/router/discovery/media_sink_internal.h
diff --git a/chrome/browser/media/router/discovery/media_sink_internal.h b/chrome/browser/media/router/discovery/media_sink_internal.h
index 9d57beb07c583a7392b5ec5c148812806c49f060..7a11e85e47a87fd1b4b5af9bf6981082cc570bd7 100644
--- a/chrome/browser/media/router/discovery/media_sink_internal.h
+++ b/chrome/browser/media/router/discovery/media_sink_internal.h
@@ -25,6 +25,10 @@ struct DialSinkExtraData {
   GURL app_url;
 
   DialSinkExtraData();
+  // Used by unit tests.
+  DialSinkExtraData(const std::string& ip_address,
+                    const std::string& model_name,
+                    const std::string& app_url);
   DialSinkExtraData(const DialSinkExtraData& other);
   ~DialSinkExtraData();
 
@@ -73,6 +77,7 @@ class MediaSinkInternal {
 
   MediaSinkInternal& operator=(const MediaSinkInternal& other);
   bool operator==(const MediaSinkInternal& other) const;
+  bool operator!=(const MediaSinkInternal& other) const;
 
   // Used by mojo.
   void set_sink_id(const MediaSink::Id& sink_id) { sink_.set_sink_id(sink_id); }