[Media Router] Add MediaSink subtypes

net/interfaces/host_resolver_service.mojom

Index: net/interfaces/host_resolver_service.mojom
diff --git a/net/interfaces/host_resolver_service.mojom b/net/interfaces/host_resolver_service.mojom
index adcdca4d8a6cd16ea71b4f69c225aa1c7e1e3530..be6efc4356a3c00aaacb922b91bf2cb6da9d3d14 100644
--- a/net/interfaces/host_resolver_service.mojom
+++ b/net/interfaces/host_resolver_service.mojom
@@ -27,6 +27,13 @@ struct HostResolverRequestInfo {
   bool is_my_ip_address;
 };
 
+// Mirror of net::IPAddress.
+struct IPAddress {
+  // IP address as a numeric value from most to least significant byte.
+  // Will be of length 4 for IPv4 addresses and 16 for IPv6.
+  array<uint8> address;
+};
+
 // Mirror of net::IPEndPoint.
 struct IPEndPoint {
   // IP address as a numeric value from most to least significant byte.