Add brotli support

vendor/github.com/dsnet/compress/brotli/writer.go

@@ -0,0 +1,35 @@
+// Copyright 2015, Joe Tsai. All rights reserved.
+// Use of this source code is governed by a BSD-style
+// license that can be found in the LICENSE.md file.
+
+package brotli
+
+import "io"
+
+type writer struct {
+	InputOffset  int64 // Total number of bytes issued to Write
+	OutputOffset int64 // Total number of bytes written to underlying io.Writer
+
+	wr  bitWriter // Output destination
+	err error     // Persistent error
+}
+
+type writerConfig struct {
+	_ struct{} // Blank field to prevent unkeyed struct literals
+}
+
+func newWriter(w io.Writer, conf *writerConfig) (*writer, error) {
+	return nil, nil
+}
+
+func (bw *writer) Write(buf []byte) (int, error) {
+	return 0, nil
+}
+
+func (bw *writer) Close() error {
+	return nil
+}
+
+func (bw *writer) Reset(w io.Writer) {
+	return
+}