[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/benchmarks/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 import benchmark
+
 from benchmarks import silk_flags
 from benchmarks import webgl_expectations
 from measurements import smoothness
 import page_sets
-from telemetry import benchmark
 
 
 class SmoothnessTop25(benchmark.Benchmark):
   """Measures rendering statistics while scrolling down the top 25 web pages.
 
   http://www.chromium.org/developers/design-documents/rendering-benchmarks
   """
   test = smoothness.Smoothness
   page_set = page_sets.Top25SmoothPageSet
 
@@ skipping 258 matching lines @@
   tag = 'sync_scroll'
   test = smoothness.Smoothness
   page_set = page_sets.PathologicalMobileSitesPageSet
 
   def CustomizeBrowserOptions(self, options):
     silk_flags.CustomizeBrowserOptionsForSyncScrolling(options)
 
   @classmethod
   def Name(cls):
     return 'smoothness.sync_scroll.pathological_mobile_sites'