Adds script to update system ui shared libary.

Run in current environment:
. update_shared_lib.sh ~/src/ub-launcher3-master

Test: local
Change-Id: I1a63eddd59135e4eace1c5dd24b1026383957099

packages/SystemUI/scripts/update_shared_lib.sh

+#!/bin/sh
+
+NUM_ARGS=$#
+
+has_croot() {
+  declare -F croot > /dev/null
+  return $?
+}
+
+check_environment() {
+  if ! has_croot; then
+    echo "Run script in a shell that has had envsetup run. Run '. update_shared_lib.sh' from scripts directory"
+    return 1
+  fi
+
+  if [ $NUM_ARGS -ne 1 ]; then
+    echo "Usage: . update_shared_lib PATH_TO_UNBUNDLED_LAUNCER     e.g. . update_shared_lib ~/src/ub-launcher3-master"
+    return 1
+  fi
+  return 0
+}
+
+main() {
+  if check_environment ; then
+    pushd .
+    croot
+    mma -j16 SystemUISharedLib
+    JAR_DESTINATION="$1/prebuilts/framework_intermediates/quickstep/libs/sysui_shared.jar"
+    cp out/target/product/$TARGET_PRODUCT/obj/JAVA_LIBRARIES/SystemUISharedLib_intermediates/javalib.jar $JAR_DESTINATION
+    popd
+  fi
+}
+
+main
+