Create metric_tool to deal with metric definitions

infra/tools/metric_tool/test/data/normal_case.py

+# 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.
+
+"""Example containing all metrics, all with descriptions.
+
+Tests assume the description contains the name of the metric, without
+the prefix.
+"""
+from infra_libs import ts_mon
+
+metric1 = ts_mon.BooleanMetric('/my/metric1', description='metric1')
+metric2 = ts_mon.CounterMetric('/my/metric2', description='metric2')
+metric3 = ts_mon.CumulativeDistributionMetric('/my/metric3',
+                                              description='metric3')
+metric4 = ts_mon.CumulativeMetric('/my/metric4', description='metric4')
+
+
+# Add a wrapping function to check that we're finding those as well.
+def nice_function():
+  # Checking that we really ignore comments.
+  # ts_mon.FloatMetric('/my/metric11', description='metric11')
+
+  metric6 = ts_mon.FloatMetric('/my/metric6', description='metric6')
+  metric7 = ts_mon.GaugeMetric('/my/metric7', description='metric7')
+  metric8 = ts_mon.NonCumulativeDistributionMetric('/my/metric8',
+                                                   description='metric8')
+  metric9 = ts_mon.StringMetric('/my/metric9', description='metric9')
+  # Use all variables to silence pylint.
+  print metric6, metric7, metric8, metric9
+
+
+# Some unrelated code to add noise
+if __name__ == '__main__':
+  pass