[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/measurements/v8_gc_times_unittest.py

 # Copyright 2015 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 measurements import v8_gc_times
 from telemetry.core import wpr_modes
 from telemetry.page import page as page_module
 from telemetry.results import page_test_results
 from telemetry.timeline import model as model_module
 from telemetry.unittest_util import options_for_unittests
 from telemetry.unittest_util import page_test_test_case
 
+from measurements import v8_gc_times
+
 
 class V8GCTimesTestPageHelper(object):
 
   def __init__(self, page_set):
     self._page_set = page_set
     self._model = model_module.TimelineModel()
     self._renderer_process = self._model.GetOrCreateProcess(1)
     self._renderer_thread = self._renderer_process.GetOrCreateThread(2)
     self._renderer_thread.name = 'CrRendererMain'
 
@@ skipping 231 matching lines @@
           'v8_gc_mark_compactor_idle_deadline_overrun': ('ms', 0.0),
           'v8_gc_mark_compactor_outside_idle': ('ms', 0.0),
           'v8_gc_mark_compactor_percentage_idle': ('idle%', 0.0),
           'v8_gc_scavenger': ('ms', 0.0),
           'v8_gc_scavenger_idle_deadline_overrun': ('ms', 0.0),
           'v8_gc_scavenger_outside_idle': ('ms', 0.0),
           'v8_gc_scavenger_percentage_idle': ('idle%', 0.0),
           'v8_gc_total': ('ms', 0.0),
           'v8_gc_total_idle_deadline_overrun': ('ms', 0.0),
           'v8_gc_total_outside_idle': ('ms', 0.0)}