input+sweep: let weightestimator take known TxOut

sweep/weight_estimator.go

@@ -2,6 +2,7 @@ package sweep
 
 import (
 	"github.com/btcsuite/btcd/chaincfg/chainhash"
+	"github.com/btcsuite/btcd/wire"
 	"github.com/btcsuite/btcutil"
 	"github.com/lightningnetwork/lnd/input"
 	"github.com/lightningnetwork/lnd/lnwallet/chainfee"
@@ -92,6 +93,12 @@ func (w *weightEstimator) addP2WKHOutput() {
 	w.estimator.AddP2WKHOutput()
 }
 
+// addOutput updates the weight estimate to account for the known
+// output given.
+func (w *weightEstimator) addOutput(txOut *wire.TxOut) {
+	w.estimator.AddTxOutput(txOut)
+}
+
 // weight gets the estimated weight of the transaction.
 func (w *weightEstimator) weight() int {
 	return w.estimator.Weight()