Add grpc_call_get_peer
diff --git a/src/core/transport/chttp2/internal.h b/src/core/transport/chttp2/internal.h
index e5e6f44..e7901da 100644
--- a/src/core/transport/chttp2/internal.h
+++ b/src/core/transport/chttp2/internal.h
@@ -286,6 +286,7 @@
   grpc_endpoint *ep;
   grpc_mdctx *metadata_context;
   gpr_refcount refs;
+  char *peer_string;
 
   gpr_mu mu;