Don't install autotest bits to the image.

common.sh

 # Copyright (c) 2010 The Chromium OS Authors. All rights reserved.
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
 # Common constants for build scripts
 # This must evaluate properly for both /bin/bash and /bin/sh
 
 # All scripts should die on error unless commands are specifically excepted
 # by prefixing with '!' or surrounded by 'set +e' / 'set -e'.
 # TODO: Re-enable this once shflags is less prone to dying.
@@ skipping 113 matching lines @@
 fi
 
 # Directory locations inside the dev chroot
 CHROOT_TRUNK_DIR="/home/$USER/trunk"
 
 # Install make for portage ebuilds.  Used by build_image and gmergefs.
 DEFAULT_INSTALL_MASK="/usr/include /usr/man /usr/share/man /usr/share/doc \
   /usr/share/gtk-doc /usr/share/gtk-2.0 /usr/lib/gtk-2.0/include \
   /usr/share/info /usr/share/aclocal /usr/lib/gcc /usr/lib/pkgconfig \
   /usr/share/pkgconfig /usr/share/gettext /usr/share/readline /etc/runlevels \
-  /usr/share/openrc /lib/rc *.a *.la /etc/init.d /usr/lib/debug"
+  /usr/share/openrc /lib/rc *.a *.la /etc/init.d /usr/lib/debug
+  /usr/local/autotest /usr/local/autotest-chrome"
 
 FACTORY_INSTALL_MASK="/opt/google/chrome /opt/google/o3d /opt/netscape \
   /usr/lib/dri /usr/lib/python2.6/test /usr/share/chewing /usr/share/fonts \
   /usr/share/ibus-pinyin /usr/share/libhangul /usr/share/locale \
   /usr/share/m17n /usr/share/mime /usr/share/sounds /usr/share/tts \
-  /usr/share/X11 /usr/share/zoneinfo /usr/lib/debug"
+  /usr/share/X11 /usr/share/zoneinfo /usr/lib/debug
+  /usr/local/autotest /usr/local/autotest-chrome"
 
 # Check to ensure not running old scripts
 V_REVERSE=''
 V_VIDOFF=''
 case "$(basename $0)" in
   build_image.sh|build_platform_packages.sh|customize_rootfs.sh|make_chroot.sh)
   echo
   echo "$V_REVERSE============================================================"
   echo "===========================  WARNING  ======================"
   echo "============================================================$V_VIDOFF"
@@ skipping 298 matching lines @@
 start_time=$(date +%s)
 
 # Print time elsapsed since start_time.
 print_time_elapsed() {
   end_time=$(date +%s)
   elapsed_seconds="$(( $end_time - $start_time ))"
   minutes="$(( $elapsed_seconds / 60 ))"
   seconds="$(( $elapsed_seconds % 60 ))"
   echo "Elapsed time: ${minutes}m${seconds}s"
 }