Add python-xlib to factory toolkit.

BUG=chrome-os-partner:29583
TEST=manually make factory toolkit and verify

Change-Id: I94aa3aff2f25fd3c4d8d8cc7a6044ef602fe967b
Reviewed-on: https://chromium-review.googlesource.com/205641
Reviewed-by: Ricky Liang <jcliang@chromium.org>
Commit-Queue: Ricky Liang <jcliang@chromium.org>
Tested-by: Ricky Liang <jcliang@chromium.org>
diff --git a/make_factory_toolkit.sh b/make_factory_toolkit.sh
index 3fc56e1..0d6edf6 100755
--- a/make_factory_toolkit.sh
+++ b/make_factory_toolkit.sh
@@ -60,7 +60,8 @@
 
   export INSTALL_MASK="${FACTORY_TEST_INSTALL_MASK}"
   emerge-${FLAGS_board} --root="${temp_pack_root}" --nodeps --usepkgonly -v \
-    chromeos-factory chromeos-factory-board autotest-factory-install
+    chromeos-factory chromeos-factory-board autotest-factory-install \
+    python-xlib
 
   local factory_repo="${CHROOT_TRUNK_DIR}/src/platform/factory"
   local repo_status_script="${factory_repo}/py/toolkit/print_repo_status.py"