[net] Add a typemap for net::IPAddress

net/interfaces/ip_address_struct_traits.h

Index: net/interfaces/ip_address_struct_traits.h
diff --git a/net/interfaces/ip_address_struct_traits.h b/net/interfaces/ip_address_struct_traits.h
new file mode 100644
index 0000000000000000000000000000000000000000..9c97baf8f6f11a02510769c9a406bb364d51f48a
--- /dev/null
+++ b/net/interfaces/ip_address_struct_traits.h
@@ -0,0 +1,24 @@
+// Copyright 2017 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 NET_INTERFACES_IP_ADDRESS_STRUCT_TRAITS_H_
+#define NET_INTERFACES_IP_ADDRESS_STRUCT_TRAITS_H_
+
+#include "mojo/public/cpp/bindings/struct_traits.h"
+#include "net/base/ip_address.h"
+#include "net/interfaces/ip_address.mojom.h"
+
+namespace mojo {
+template <>
+struct StructTraits<net::interfaces::IPAddressDataView, net::IPAddress> {
+  static const std::vector<uint8_t>& address(const net::IPAddress& ip_address) {
+    return ip_address.bytes();
+  }
+
+  static bool Read(net::interfaces::IPAddressDataView obj, net::IPAddress* out);
+};
+
+}  // namespace mojo
+
+#endif  // NET_INTERFACES_IP_ADDRESS_STRUCT_TRAITS_H_