Make a global enum to differentiate impl & proxy.

ppapi/shared_impl/private/udp_socket_private_impl.cc

Index: ppapi/shared_impl/private/udp_socket_private_impl.cc
diff --git a/ppapi/shared_impl/private/udp_socket_private_impl.cc b/ppapi/shared_impl/private/udp_socket_private_impl.cc
index 23f125d0acf1fca4445284ef33bf72078e7cd2bf..9926f8f42e2ee4c68f61136d89be926678e13d67 100644
--- a/ppapi/shared_impl/private/udp_socket_private_impl.cc
+++ b/ppapi/shared_impl/private/udp_socket_private_impl.cc
@@ -22,13 +22,13 @@ const int32_t UDPSocketPrivateImpl::kMaxWriteSize = 1024 * 1024;
 
 UDPSocketPrivateImpl::UDPSocketPrivateImpl(const HostResource& resource,
                                            uint32 socket_id)
-    : Resource(resource) {
+    : Resource(OBJECT_IS_PROXY, resource) {
   Init(socket_id);
 }
 
 UDPSocketPrivateImpl::UDPSocketPrivateImpl(PP_Instance instance,
                                            uint32 socket_id)
-    : Resource(instance) {
+    : Resource(OBJECT_IS_IMPL, instance) {
   Init(socket_id);
 }