Convert Histograms to CSV.

tracing/bin/histograms2csv

Index: tracing/bin/histograms2csv
diff --git a/tracing/bin/histograms2csv b/tracing/bin/histograms2csv
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+++ b/tracing/bin/histograms2csv
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+#!/usr/bin/env python
+# 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 argparse
+import codecs
+import json
+import sys
+import os
+
+tracing_path = os.path.abspath(os.path.join(
+  os.path.dirname(os.path.realpath(__file__)), '..'))
+sys.path.append(tracing_path)
+import tracing_project
+tracing_project.UpdateSysPathIfNeeded()
+import vinn
+
+
+_HISTOGRAMS_TO_CSV_CMD_LINE = os.path.join(
+    tracing_path, 'tracing', 'value', 'histograms_to_csv_cmdline.html')
+
+
+def main():
+  parser = argparse.ArgumentParser(
+      description='Upgrade a results2 instance or add a new HistogramSet.',
+      add_help=False)
+  parser.add_argument('json_path',
+                      help='HistogramSet JSON file path (input).')
+  parser.add_argument('csv_path',
+                      help='CSV file path (output).')
+  parser.add_argument('-h', '--help', action='help',
+                      help='Show this help message and exit.')
+  args = parser.parse_args()
+  result = vinn.RunFile(
+      _HISTOGRAMS_TO_CSV_CMD_LINE,
+      source_paths=list(tracing_project.TracingProject().source_paths),
+      js_args=[os.path.abspath(args.json_path)])
+  if result.returncode != 0:
+    sys.stderr.write(result.stdout)
+  else:
+    file(args.csv_path, 'w').write(result.stdout)
+  return result.returncode
+
+if __name__ == '__main__':
+  sys.exit(main())