Make VR latency results compatible with perf dashboard, refactor into classes

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
deleted file mode 100644
index 6e158dd02f35b72221629f467818a52dd7f614b6..0000000000000000000000000000000000000000
--- a/chrome/test/vr/perf/latency/BUILD.gn
+++ /dev/null
@@ -1,13 +0,0 @@
-# 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",
-  ]
-}