[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/measurements/repaint.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 telemetry.page import page_test
+
 from measurements import smoothness_controller
-from telemetry.page import page_test
 
 
 class Repaint(page_test.PageTest):
   def __init__(self, mode='viewport', width=None, height=None):
     super(Repaint, self).__init__()
     self._smoothness_controller = None
     self._micro_benchmark_id = None
     self._mode = mode
     self._width = width
     self._height = height
@@ skipping 46 matching lines @@
                   "notify_done": true
                 });
     """)
     self._smoothness_controller.Stop(tab)
 
   def ValidateAndMeasurePage(self, page, tab, results):
     self._smoothness_controller.AddResults(tab, results)
 
   def CleanUpAfterPage(self, _, tab):
     self._smoothness_controller.CleanUp(tab)