Convert chart-json to Histograms.

tracing/tracing/value/convert_chart_json.py

Index: tracing/tracing/value/convert_chart_json.py
diff --git a/tracing/tracing/value/convert_chart_json.py b/tracing/tracing/value/convert_chart_json.py
new file mode 100755
index 0000000000000000000000000000000000000000..10dabee5ccf7991e2a2d12a0b1acace82a7c08e3
--- /dev/null
+++ b/tracing/tracing/value/convert_chart_json.py
@@ -0,0 +1,24 @@
+# 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
+import tracing_project
+import vinn
+
+
+def ConvertChartJson(chart_json):
+  """Convert chart_json to Histograms.
+
+  Args:
+    chart_json: path to a file containing chart-json
+
+  Returns:
+    a Vinn result object whose 'returncode' indicates whether there was an
+    exception, and whose 'stdout' contains HistogramSet json.
+  """
+  return vinn.RunFile(
+      os.path.join(os.path.dirname(__file__),
+                   'convert_chart_json_cmdline.html'),
+      source_paths=tracing_project.TracingProject().source_paths,
+      js_args=[os.path.abspath(chart_json)])