[Media Router] Add MediaSink subtypes

net/dns/mojo_host_struct_traits.h

Index: net/dns/mojo_host_struct_traits.h
diff --git a/net/dns/mojo_host_struct_traits.h b/net/dns/mojo_host_struct_traits.h
index 307e1b22ba8371aa75bb145abc95825e6270c523..3dcc7d6071a9a8fc13e4492c9b4086d7fabd71f8 100644
--- a/net/dns/mojo_host_struct_traits.h
+++ b/net/dns/mojo_host_struct_traits.h
@@ -49,6 +49,15 @@ struct StructTraits<net::interfaces::HostResolverRequestInfoDataView,
 };
 
 template <>
+struct StructTraits<net::interfaces::IPAddressDataView, net::IPAddress> {
+  static const std::vector<uint8_t>& address(const net::IPAddress& obj) {
+    return obj.bytes();
+  }
+
+  static bool Read(net::interfaces::IPAddressDataView obj, net::IPAddress* out);
+};
+
+template <>
 struct StructTraits<net::interfaces::IPEndPointDataView, net::IPEndPoint> {
   static const std::vector<uint8_t>& address(const net::IPEndPoint& obj) {
     return obj.address().bytes();