[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/benchmarks/service_worker.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.
 
 import collections
 import page_sets
 import re
 
-from measurements import timeline_controller
-from metrics import speedindex
 from telemetry import benchmark
 from telemetry.core import util
 from telemetry.page import page_test
 from telemetry.timeline import async_slice as async_slice_module
 from telemetry.timeline import slice as slice_module
 from telemetry.value import scalar
 
+from measurements import timeline_controller
+from metrics import speedindex
+
 
 class _ServiceWorkerTimelineMetric(object):
   def AddResultsOfCounters(self, process, counter_regex_string, results):
     counter_filter = re.compile(counter_regex_string)
     for counter_name, counter in process.counters.iteritems():
       if not counter_filter.search(counter_name):
         continue
 
       total = sum(counter.totals)
 
@@ skipping 167 matching lines @@
   https://jakearchibald.github.io/trained-to-thrill/) are included. Execution
   time of these pages will be shown as Speed Index, and TRACE_EVENTs are
   subsidiary information to know more detail performance regression.
   """
   test = _ServiceWorkerMicroBenchmarkMeasurement
   page_set = page_sets.ServiceWorkerMicroBenchmarkPageSet
   @classmethod
   def Name(cls):
     return 'service_worker.service_worker_micro_benchmark'