Fix import order with isort tool.

tools/telemetry/telemetry/value/summary.py

 # Copyright 2014 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 collections import defaultdict
 
 from telemetry.value import failure
 from telemetry.value import merge_values
 from telemetry.value import skip
 
+
 class Summary(object):
   """Computes summary values from the per-page-run values produced by a test.
 
   Some telemetry benchmark repeat a number of times in order to get a reliable
   measurement. The test does not have to handle merging of these runs:
   summarizer does it for you.
 
   For instance, if two pages run, 3 and 1 time respectively:
       ScalarValue(page1, 'foo', units='ms', 1)
       ScalarValue(page1, 'foo', units='ms', 1)
@@ skipping 130 matching lines @@
       should_print = True
     else:
       should_print = False
 
     if not should_print:
       return
 
     # Actually save the result.
     self._computed_per_page_values.append(value)
     self._interleaved_computed_per_page_values_and_summaries.append(value)