Create metric_tool to deal with metric definitions

infra/tools/metric_tool/__main__.py

Index: infra/tools/metric_tool/__main__.py
diff --git a/infra/tools/metric_tool/__main__.py b/infra/tools/metric_tool/__main__.py
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+++ b/infra/tools/metric_tool/__main__.py
@@ -0,0 +1,37 @@
+# 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.
+"""Utilities to deal with metrics.
+
+Extracting all metrics in a set of Python files:
+./run.py infra.tools.metric_tool extract
+"""
+# This file is untested, keep as little code as possible in there.
+
+import logging
+import sys
+
+from infra.tools.metric_tool import metric_tool
+import infra_libs
+
+
+# https://chromium.googlesource.com/infra/infra/+/master/infra_libs/logs/README.md
+LOGGER = logging.getLogger(__name__)
+
+
+class Metric_tool(infra_libs.BaseApplication):
+  DESCRIPTION = sys.modules['__main__'].__doc__
+  PROG_NAME = 'metric_tool'
+
+  def add_argparse_options(self, parser):
+    super(Metric_tool, self).add_argparse_options(parser)
+    parser.add_argument('path', type=str,
+                        help='Directory to recursively scan for Python files.')
+
+  def main(self, opts):
+    # Do more processing here
+    metric_tool.main(opts.path)
+
+
+if __name__ == '__main__':
+  Metric_tool().run()