Added OWNERS to Shell and hook to make sure it's developed on AOSP.

Bug: none
Test: none

Change-Id: I1f6f554cf98c78d1ab8a1e820d485a37238230f5
diff --git a/PREUPLOAD.cfg b/PREUPLOAD.cfg
index 07b0ae1..01df817 100644
--- a/PREUPLOAD.cfg
+++ b/PREUPLOAD.cfg
@@ -16,3 +16,5 @@
 hidden_api_txt_hook = ${REPO_ROOT}/frameworks/base/tools/hiddenapi/checksorted_sha.sh ${PREUPLOAD_COMMIT} ${REPO_ROOT}
 
 owners_hook = ${REPO_ROOT}/frameworks/base/tools/aosp/aosp_sha.sh ${PREUPLOAD_COMMIT} "OWNERS$"
+
+shell_hook = ${REPO_ROOT}/frameworks/base/tools/aosp/aosp_sha.sh ${PREUPLOAD_COMMIT} "^packages/Shell/"