Adding unbundled uiautomator jar from AOSP to third_party.

third_party/ub-uiautomator/BUILD.gn

Index: third_party/ub-uiautomator/BUILD.gn
diff --git a/third_party/ub-uiautomator/BUILD.gn b/third_party/ub-uiautomator/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..07ec3b339bf8149f522c2c12d63c0a1f803529a9
--- /dev/null
+++ b/third_party/ub-uiautomator/BUILD.gn
@@ -0,0 +1,10 @@
+# Copyright 2015 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+import("//build/config/android/rules.gni")
+
+# GYP: //third_party/ub-uiautomator/ub-uiautomator.gyp:ub_uiautomator_jar
+java_prebuilt("ub_uiautomator_java") {
+  jar_path = "lib/ub-uiautomator.jar"
+}