[Telemetry] Copy perf_result_data_type.py & perf_tests_results_helper.py to telemetry/util

tools/telemetry/telemetry/value/histogram.py

Index: tools/telemetry/telemetry/value/histogram.py
diff --git a/tools/telemetry/telemetry/value/histogram.py b/tools/telemetry/telemetry/value/histogram.py
index 64766c8a95aed00aba00bb1297018b4b67fa5d67..c55e895abae0d274a6bae731c80c9c5775b9bd53 100644
--- a/tools/telemetry/telemetry/value/histogram.py
+++ b/tools/telemetry/telemetry/value/histogram.py
@@ -3,10 +3,11 @@
 # found in the LICENSE file.
 import json
 
-from telemetry import perf_tests_helper
+from telemetry.util import perf_tests_helper
 from telemetry import value as value_module
 from telemetry.value import histogram_util
 
+
 class HistogramValueBucket(object):
   def __init__(self, low, high, count=0):
     self.low = low