Test virtual interface [NOT FOR REVIEW]

components/tracing/test/tracing_virtual_tradeoff.py

Index: components/tracing/test/tracing_virtual_tradeoff.py
diff --git a/components/tracing/test/tracing_virtual_tradeoff.py b/components/tracing/test/tracing_virtual_tradeoff.py
new file mode 100755
index 0000000000000000000000000000000000000000..3df9d1ceb76b8d2ba374d5399baac53338d50ffa
--- /dev/null
+++ b/components/tracing/test/tracing_virtual_tradeoff.py
@@ -0,0 +1,33 @@
+#!/usr/bin/env python
+# Copyright (c) 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.
+
+import fileinput
+
+
+def main():
+  perf_virtual = []
+  perf_direct = []
+
+  for line in fileinput.input():
+    if 'virtual_calls: events= ' in line:
+      measure = int(line.split('virtual_calls: events= ')[1].split(' ms')[0])
+      perf_virtual.append(measure)
+    if 'direct_calls: events= ' in line:
+      measure = int(line.split('direct_calls: events= ')[1].split(' ms')[0])
+      perf_direct.append(measure)
+
+  perf_virtual.sort()
+  perf_direct.sort()
+  median_virtual = perf_virtual[len(perf_virtual) / 2]
+  median_direct = perf_direct[len(perf_direct) / 2]
+  tradeoff = float(median_virtual) / float(median_direct) - 1.0
+
+  print('Median virtual: {0} ms'.format(median_virtual))
+  print('Median direct: {0} ms'.format(median_direct))
+  print('Tradeoff: {0:.2f}%'.format(tradeoff * 100))
+
+
+if __name__ == '__main__':
+  main()