[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/benchmarks/power.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 import benchmark
+
 from measurements import power
 import page_sets
-from telemetry import benchmark
 
 
 @benchmark.Enabled('android')
 class PowerAndroidAcceptance(benchmark.Benchmark):
   """Android power acceptance test."""
   test = power.Power
   page_set = page_sets.AndroidAcceptancePageSet
   @classmethod
   def Name(cls):
     return 'power.android_acceptance'
 
 
 
 @benchmark.Enabled('android')
 class PowerTypical10Mobile(benchmark.Benchmark):
   """Android typical 10 mobile power test."""
   test = power.Power
   page_set = page_sets.Typical10MobilePageSet
   @classmethod
   def Name(cls):
     return 'power.typical_10_mobile'