Copy perf_tests_helper.py into build/util/lib

build/util/lib/common/perf_result_data_type.py

Index: build/util/lib/common/perf_result_data_type.py
===================================================================
--- build/util/lib/common/perf_result_data_type.py	(revision 0)
+++ build/util/lib/common/perf_result_data_type.py	(revision 0)
@@ -0,0 +1,20 @@
+# 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.
+
+DEFAULT = 'default'
+UNIMPORTANT = 'unimportant'
+HISTOGRAM = 'histogram'
+UNIMPORTANT_HISTOGRAM = 'unimportant-histogram'
+INFORMATIONAL = 'informational'
+
+ALL_TYPES = [DEFAULT, UNIMPORTANT, HISTOGRAM, UNIMPORTANT_HISTOGRAM,
+             INFORMATIONAL]
+
+
+def IsValidType(datatype):
+  return datatype in ALL_TYPES
+
+
+def IsHistogram(datatype):
+  return (datatype == HISTOGRAM or datatype == UNIMPORTANT_HISTOGRAM)