Add a file that triggers for Chrome Media Router telemetry tests.

Change-Id: If93e959f82073fb6f1ad6dd22dd21979300c2e7f
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1627708
Auto-Submit: Clifford Cheng <cliffordcheng@chromium.org>
Reviewed-by: Takumi Fujimoto <takumif@chromium.org>
Commit-Queue: Clifford Cheng <cliffordcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#664857}

tools/perf/contrib/media_router_benchmarks/run_benchmark.py

+# Copyright 2019 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 os
+import sys
+
+# Add //tools/perf/ to system path.
+sys.path.append(os.path.join(os.path.dirname(__file__), os.pardir, os.pardir))
+
+from core import path_util
+sys.path.insert(1, path_util.GetTelemetryDir())
+
+from telemetry import benchmark_runner
+
+from chrome_telemetry_build import chromium_config
+
+
+def main():
+  config = chromium_config.ChromiumConfig(
+      benchmark_dirs=[path_util.GetOfficialBenchmarksDir(),
+                      path_util.GetContribDir()],
+      top_level_dir=path_util.GetPerfDir(),
+      expectations_files=[path_util.GetExpectationsPath()])
+  return benchmark_runner.main(config)
+
+
+if __name__ == '__main__':
+  sys.exit(main())