Convert chart-json to Histograms.

tracing/tracing/value/convert_chart_json_test.html

Index: tracing/tracing/value/convert_chart_json_test.html
diff --git a/tracing/tracing/ui/base/polymer_postload.html b/tracing/tracing/value/convert_chart_json_test.html
similarity index 59%
copy from tracing/tracing/ui/base/polymer_postload.html
copy to tracing/tracing/value/convert_chart_json_test.html
index fc93631bb88c4783c69b90d138aa56ca38d084c7..14d07d038a70445359a9d1f700f4f4a7c9d9329d 100644
--- a/tracing/tracing/ui/base/polymer_postload.html
+++ b/tracing/tracing/value/convert_chart_json_test.html
@@ -4,10 +4,14 @@ 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.
 -->
+
+<link rel="import" href="/tracing/value/convert_chart_json.html">
+
 <script>
 'use strict';
 
-if (!Polymer.Settings.useNativeShadow) {
-  tr.b.showPanic('Polymer error', 'base only works in shadow mode');
-}
+tr.b.unittest.testSuite(function() {
+  test('convert', function() {
+  });
+});
 </script>