[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/measurements/smoothness.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.
 
+from telemetry.page import page_test
+
+from measurements import smoothness_controller
 from metrics import power
-from measurements import smoothness_controller
-from telemetry.page import page_test
 
 
 class Smoothness(page_test.PageTest):
   def __init__(self):
     super(Smoothness, self).__init__()
     self._power_metric = None
     self._smoothness_controller = None
 
   @classmethod
   def CustomizeBrowserOptions(cls, options):
@@ skipping 19 matching lines @@
 
   def ValidateAndMeasurePage(self, page, tab, results):
     self._power_metric.AddResults(tab, results)
     self._smoothness_controller.AddResults(tab, results)
 
   def CleanUpAfterPage(self, page, tab):
     if self._power_metric:
       self._power_metric.Stop(page, tab)
     if self._smoothness_controller:
       self._smoothness_controller.CleanUp(tab)