[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/benchmarks/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 import benchmark
+
 from benchmarks import silk_flags
 from measurements import repaint as repaint_measurement
 import page_sets
-from telemetry import benchmark
 
 
 class _Repaint(benchmark.Benchmark):
   @classmethod
   def AddBenchmarkCommandLineArgs(cls, parser):
     parser.add_option('--mode', type='string',
                       default='viewport',
                       help='Invalidation mode. '
                       'Supported values: fixed_size, layer, random, viewport.')
     parser.add_option('--width', type='int',
@@ skipping 30 matching lines @@
 
   http://www.chromium.org/developers/design-documents/rendering-benchmarks"""
   tag = 'gpu_rasterization'
   page_set = page_sets.KeyMobileSitesRepaintPageSet
   def CustomizeBrowserOptions(self, options):
     silk_flags.CustomizeBrowserOptionsForGpuRasterization(options)
   @classmethod
   def Name(cls):
     return 'repaint.gpu_rasterization.key_mobile_sites_repaint'