[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/metrics/speedindex_unittest.py

 # Copyright 2013 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.
 
 # These tests access private methods in the speedindex module.
 # pylint: disable=W0212
 
 import json
 import os
 import unittest
 
-from metrics import speedindex
 from telemetry.image_processing import histogram
 from telemetry.image_processing import rgba_color
 
+from metrics import speedindex
+
 
 class FakeImageUtil(object):
   # pylint: disable=W0613
   def GetColorHistogram(self, image, ignore_color=None, tolerance=None):
     return image.ColorHistogram()
 
 
 class FakeVideo(object):
   def __init__(self, frames):
     self._frames = frames
@@ skipping 86 matching lines @@
     self.assertEqual(time_completeness[2], (0.2, 0.0))
     self.assertEqual(time_completeness[3], (0.3, 1.0))
 
   def assertTimeCompleteness(self, time_completeness, time, completeness):
     self.assertEqual(time_completeness[0], time)
     self.assertAlmostEqual(time_completeness[1], completeness)
 
 
 if __name__ == "__main__":
   unittest.main()