[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/metrics/timeline.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
+
 from telemetry.util.statistics import DivideIfPossibleOrZero
-
+from telemetry.value import scalar
 from telemetry.web_perf.metrics import timeline_based_metric
-from telemetry.value import scalar
 
 
 class LoadTimesTimelineMetric(timeline_based_metric.TimelineBasedMetric):
   def __init__(self):
     super(LoadTimesTimelineMetric, self).__init__()
     self.report_main_thread_only = True
 
   def AddResults(self, model, renderer_thread, interaction_records, results):
     assert model
     assert len(interaction_records) == 1, (
@@ skipping 249 matching lines @@
     num_frames = frame_rate_thread.CountTracesWithName(FrameTraceName)
 
     # Report the desired results and details.
     for thread_results in thread_category_results.values():
       if thread_results.name in self.results_to_report:
         thread_results.AddResults(num_frames, results)
       # TOOD(nduca): When generic results objects are done, this special case
       # can be replaced with a generic UI feature.
       if thread_results.name in self.details_to_report:
         thread_results.AddDetailedResults(num_frames, results)