[NaCl SDK] nacl_io: add getnameinfo scaffolding

native_client_sdk/src/libraries/nacl_io/host_resolver.h

Index: native_client_sdk/src/libraries/nacl_io/host_resolver.h
diff --git a/native_client_sdk/src/libraries/nacl_io/host_resolver.h b/native_client_sdk/src/libraries/nacl_io/host_resolver.h
index 2647e29a674e270421f7ee0653d15a0d13fc1fa3..cb2365f6d0e7527f04129e1c8d6a009080b6518a 100644
--- a/native_client_sdk/src/libraries/nacl_io/host_resolver.h
+++ b/native_client_sdk/src/libraries/nacl_io/host_resolver.h
@@ -21,6 +21,13 @@ class HostResolver {
   void Init(PepperInterface* ppapi);
 
   void freeaddrinfo(struct addrinfo* res);
+  int getnameinfo(const struct sockaddr *sa,
+                  socklen_t salen,
+                  char *host,
+                  size_t hostlen,
+                  char *serv,
+                  size_t servlen,
+                  int flags);
   int getaddrinfo(const char* node,
                   const char* service,
                   const struct addrinfo* hints,