Add automated VR latency tester

chrome/test/vr/perf/latency/BUILD.gn

Index: chrome/test/vr/perf/latency/BUILD.gn
diff --git a/chrome/test/vr/perf/latency/BUILD.gn b/chrome/test/vr/perf/latency/BUILD.gn
new file mode 100644
index 0000000000000000000000000000000000000000..6e158dd02f35b72221629f467818a52dd7f614b6
--- /dev/null
+++ b/chrome/test/vr/perf/latency/BUILD.gn
@@ -0,0 +1,13 @@
+# Copyright 2017 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.
+
+group("motopho_latency_test") {
+  testonly = true
+  data = [
+    "./run_latency_test.py",
+  ]
+  data_deps = [
+    "//chrome/android:chrome_public_apk",
+  ]
+}