Implement Timeline Based Measurement v2

tracing/tracing/metrics/metric_runner.py

Index: tracing/tracing/metrics/metric_runner.py
diff --git a/tracing/tracing/metrics/metric_runner.py b/tracing/tracing/metrics/metric_runner.py
new file mode 100644
index 0000000000000000000000000000000000000000..44bbc9215bdec373dd4d7a63f14c35bf5db1df54
--- /dev/null
+++ b/tracing/tracing/metrics/metric_runner.py
@@ -0,0 +1,34 @@
+# Copyright 2016 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
+
+from perf_insights import map_single_trace
+from perf_insights import function_handle
+from perf_insights.mre import file_handle
+
+_METRIC_MAP_FUNCTION_FILENAME = 'metric_map_function.html'
+
+_METRIC_MAP_FUNCTION_NAME = 'metricMapFunction'
+
+def _GetMetricsDir():
+  return os.path.dirname(os.path.abspath(__file__))
+
+def _GetMetricRunnerHandle(metrics):
+  assert isinstance(metrics, list)
+  metrics_dir = _GetMetricsDir()
+  metric_paths = [os.path.join(metrics_dir, metric) for metric in metrics]
+  metric_mapper_path = os.path.join(metrics_dir, _METRIC_MAP_FUNCTION_FILENAME)
+  metric_paths.append(metric_mapper_path)
+
+  modules_to_load = [function_handle.ModuleToLoad(filename=path) for path in
+                     metric_paths]
+
+  return function_handle.FunctionHandle(modules_to_load,
+                                        _METRIC_MAP_FUNCTION_NAME)
+
+def RunMetrics(filename, metrics):
+  th = file_handle.URLFileHandle(filename, 'file://' + filename)
+  result = map_single_trace.MapSingleTrace(th, _GetMetricRunnerHandle(metrics))
+
+  return result