[telemetry] Add support for BenchmarkResults that vary from page to page

tools/telemetry/telemetry/perf_tests_helper.py

Index: tools/telemetry/telemetry/perf_tests_helper.py
diff --git a/tools/telemetry/telemetry/perf_tests_helper.py b/tools/telemetry/telemetry/perf_tests_helper.py
new file mode 100644
index 0000000000000000000000000000000000000000..8fa8963f0a5732f94802ec8020d581cfae4b6c21
--- /dev/null
+++ b/tools/telemetry/telemetry/perf_tests_helper.py
@@ -0,0 +1,25 @@
+# Copyright (c) 2012 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.
+from __future__ import absolute_import
+
+import os
+import sys
+
+def __init__():
+  path = os.path.join(os.path.dirname(__file__),
+                      '../../../build/android')
+  path = os.path.abspath(path)
+  assert os.path.exists(os.path.join(path,
+                                     'pylib', '__init__.py'))
+  if path not in sys.path:
+    sys.path.append(path)
+
+__init__()
+
+from pylib import perf_tests_helper # pylint: disable=F0401
+GeomMeanAndStdDevFromHistogram = \
+    perf_tests_helper.GeomMeanAndStdDevFromHistogram
+PrintPerfResult = \
+    perf_tests_helper.PrintPerfResult
+