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diff --git a/src/core/ext/filters/client_channel/lb_policy/xds/xds_channel.h b/src/core/ext/filters/client_channel/lb_policy/xds/xds_channel.h
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+++ b/src/core/ext/filters/client_channel/lb_policy/xds/xds_channel.h
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+/*
+ *
+ * Copyright 2018 gRPC authors.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ *
+ */
+
+#ifndef GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_XDS_CHANNEL_H
+#define GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_XDS_CHANNEL_H
+
+#include <grpc/support/port_platform.h>
+
+#include "src/core/ext/filters/client_channel/lb_policy_factory.h"
+
+/// Makes any necessary modifications to \a args for use in the xds
+/// balancer channel.
+///
+/// Takes ownership of \a args.
+///
+/// Caller takes ownership of the returned args.
+grpc_channel_args* grpc_lb_policy_xds_modify_lb_channel_args(
+ grpc_channel_args* args);
+
+#endif /* GRPC_CORE_EXT_FILTERS_CLIENT_CHANNEL_LB_POLICY_XDS_XDS_CHANNEL_H \
+ */