Wrapper for XVFB with chrome testing work-arounds

bb-xvfb

#!/bin/sh
#
# bb-xvfb <command> <and> <its> <arguments...>
#
# Wrapper for XVFB.  Capture XVFB logs where we can see them.  Dump
# XVFB framebuffer where can we can see it.  Use a standard display size
# and dpi for all of our XVFB-wrapped tests.
#

# Note: "32" is not a valid depth for xvfb: https://bugs.freedesktop.org/show_bug.cgi?id=17453 (from 2008)
SCREEN_SIZE="1280x1024x24+32"

BINDIR="$(dirname $0)"
TMPDIR=/tmp

if [ ! -d "$TMPDIR" ]; then
    echo "Invalid tmp directory: ${TMPDIR}"
    exit 1
fi

# Avoid race conditions in google-chrome startup by making sure there is a
# dbus message bus up and running.
# See https://code.google.com/p/chromium/issues/detail?id=309093
DBUS="dbus-launch --exit-with-session"

WAITFORX="${BINDIR}/waitForX"

XVFBDIR="${TMPDIR}/xvfb.$$"
mkdir -p "${XVFBDIR}"

ERRFILE="${XVFBDIR}/xvfb.log"

# Pass the "-fbdir" to force xvfb to use a memory-mapped file.  This makes screenshots and debugging easier.
# To display said framebuffer contents: xwud -in ${XVFBDIR}/Xvfb_screen0

exec xvfb-run \
    --error-file="${ERRFILE}" \
    --auto-servernum \
    --server-args="-fbdir ${XVFBDIR} -screen 0 ${SCREEN_SIZE} -dpi 96 -ac" \
    ${WAITFORX} ${RECORD} ${DBUS} "$@"

#eof

Doing the following gives me an error:
./bb-xvfb.sh

xvfb-run: usage error: need a command to run
Usage: xvfb-run [OPTION ...] COMMAND
Run COMMAND (usually an X client) in a virtual X server environment.
Options:
-a --auto-servernum try to get a free server number, starting at
--server-num (deprecated, use --auto-display
instead)
-d --auto-display use the X server to find a display number
automatically
-e FILE --error-file=FILE file used to store xauth errors and Xvfb
output (default: /dev/null)
-f FILE --auth-file=FILE file used to store auth cookie
(default: ./.Xauthority)
-h --help display this usage message and exit
-n NUM --server-num=NUM server number to use (default: 99)
-l --listen-tcp enable TCP port listening in the X server
-p PROTO --xauth-protocol=PROTO X authority protocol name to use
(default: xauth command's default)
-s ARGS --server-args=ARGS arguments (other than server number and
"-nolisten tcp") to pass to the Xvfb server
(default: "-screen 0 640x480x8")
-w DELAY --wait=DELAY delay in seconds to wait for Xvfb to start
before running COMMAND (default: 3)
can you tell what i am doing wrong. :)

What is ${RECORD} supposed to be?