utiltests: add script to run tests

Make it easier to run the tests, so that more people
will run them.

Bug: 36698401
Test: tests/utiltests/runtests.sh \
      -e class com.android.internal.util.StateMachineTest

Change-Id: I3151fb6b2f609f45c7d8154b51f13cce58ccdc13

core/tests/utiltests/runtests.sh

@@ -0,0 +1,24 @@
+#!/usr/bin/env bash
+
+if [ -z $ANDROID_BUILD_TOP ]; then
+  echo "You need to source and lunch before you can use this script"
+  exit 1
+fi
+
+echo "Running tests"
+
+set -e # fail early
+
+echo "+ mmma -j32 $ANDROID_BUILD_TOP/frameworks/base/core/tests/utiltests"
+# NOTE Don't actually run the command above since this shell doesn't inherit functions from the
+#      caller.
+make -j32 -C $ANDROID_BUILD_TOP -f build/core/main.mk MODULES-IN-frameworks-base-core-tests-utiltests
+
+set -x # print commands
+
+adb root
+adb wait-for-device
+
+adb install -r -g "$OUT/data/app/FrameworksUtilTests/FrameworksUtilTests.apk"
+
+adb shell am instrument -w "$@" 'com.android.frameworks.utiltests/android.support.test.runner.AndroidJUnitRunner'