[Telemetry] Add support for capturing V8 object stats to Telemetry.

tools/perf/metrics/stats_table_util.py

Index: tools/perf/metrics/stats_table_util.py
diff --git a/tools/perf/metrics/stats_table_util.py b/tools/perf/metrics/stats_table_util.py
new file mode 100644
index 0000000000000000000000000000000000000000..fb8af223d1a82ec920fac5ae2ed2983635bb828e
--- /dev/null
+++ b/tools/perf/metrics/stats_table_util.py
@@ -0,0 +1,23 @@
+# Copyright 2013 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.
+
+"""This is a helper module to get and manipulate stats table data.
+
+The status table data is the same data as is visible from "chrome://stats" and
+relies on --enable-stats-table being set.
+More information can be found at: chromium/src/base/metrics/stats_table.h
+
+Stats table data is collected with the window.statsCollectionController object.
+"""
+
+import json
+
+
+def GetStatsTable(tab):
+  """Get the full stats table from the browser."""
+  stats_table_json = tab.EvaluateJavaScript(
+      'statsCollectionController.getStatsTable()')
+  if stats_table_json:
+    return json.loads(stats_table_json)
+  return None