Update vendored dependencies.

vendor/github.com/gorilla/websocket/conn.go

@@ -265,6 +265,10 @@ type Conn struct {
 }
 
 func newConn(conn net.Conn, isServer bool, readBufferSize, writeBufferSize int) *Conn {
+	return newConnBRW(conn, isServer, readBufferSize, writeBufferSize, nil)
+}
+
+func newConnBRW(conn net.Conn, isServer bool, readBufferSize, writeBufferSize int, brw *bufio.ReadWriter) *Conn {
 	mu := make(chan bool, 1)
 	mu <- true
 
@@ -274,13 +278,28 @@ func newConn(conn net.Conn, isServer bool, readBufferSize, writeBufferSize int)
 	if readBufferSize < maxControlFramePayloadSize {
 		readBufferSize = maxControlFramePayloadSize
 	}
+
+	// Reuse the supplied brw.Reader if brw.Reader's buf is the requested size.
+	var br *bufio.Reader
+	if brw != nil && brw.Reader != nil {
+		// This code assumes that peek on a reset reader returns
+		// bufio.Reader.buf[:0].
+		brw.Reader.Reset(conn)
+		if p, err := brw.Reader.Peek(0); err == nil && cap(p) == readBufferSize {
+			br = brw.Reader
+		}
+	}
+	if br == nil {
+		br = bufio.NewReaderSize(conn, readBufferSize)
+	}
+
 	if writeBufferSize == 0 {
 		writeBufferSize = defaultWriteBufferSize
 	}
 
 	c := &Conn{
 		isServer:               isServer,
-		br:                     bufio.NewReaderSize(conn, readBufferSize),
+		br:                     br,
 		conn:                   conn,
 		mu:                     mu,
 		readFinal:              true,
@@ -659,12 +678,33 @@ func (w *messageWriter) Close() error {
 	return nil
 }
 
+// WritePreparedMessage writes prepared message into connection.
+func (c *Conn) WritePreparedMessage(pm *PreparedMessage) error {
+	frameType, frameData, err := pm.frame(prepareKey{
+		isServer:         c.isServer,
+		compress:         c.newCompressionWriter != nil && c.enableWriteCompression && isData(pm.messageType),
+		compressionLevel: c.compressionLevel,
+	})
+	if err != nil {
+		return err
+	}
+	if c.isWriting {
+		panic("concurrent write to websocket connection")
+	}
+	c.isWriting = true
+	err = c.write(frameType, c.writeDeadline, frameData, nil)
+	if !c.isWriting {
+		panic("concurrent write to websocket connection")
+	}
+	c.isWriting = false
+	return err
+}
+
 // WriteMessage is a helper method for getting a writer using NextWriter,
 // writing the message and closing the writer.
 func (c *Conn) WriteMessage(messageType int, data []byte) error {
 
 	if c.isServer && (c.newCompressionWriter == nil || !c.enableWriteCompression) {
-
 		// Fast path with no allocations and single frame.
 
 		if err := c.prepWrite(messageType); err != nil {