Changes to enable dev in stateful partition for usb and startup

src/platform/init/chromeos_startup

Index: src/platform/init/chromeos_startup
diff --git a/src/platform/init/chromeos_startup b/src/platform/init/chromeos_startup
index 8e8b7801e5ef9a61fc014d979128af8c94ab0c1f..b1cc786997f6f9fe9366bf22097a116f14a35720 100755
--- a/src/platform/init/chromeos_startup
+++ b/src/platform/init/chromeos_startup
@@ -71,6 +71,12 @@ mount -n --bind /mnt/stateful_partition/var/log /var/log
 mount -n -t tmpfs -omode=1777,nodev,noexec,nosuid vartmp /var/tmp
 mount -n --bind /mnt/stateful_partition/home /home
 
+# Mount stateful partition for dev packages
+# TODO(sosa@chromium.org) - Use kernel flag
+if [ -f /root/.dev_mode ] ; then
+  mount -n --bind /mnt/stateful_partition/dev_image /usr/local
+fi
+
 mount -n -t tmpfs -omode=0755,nosuid varrun /var/run
 touch /var/run/.ramfs  # TODO: Is this needed?
 mount -n -t tmpfs -omode=1777,nodev,noexec,nosuid varlock /var/lock