[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/measurements/thread_times_unittest.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 measurements import thread_times
-from measurements import smoothness_unittest
-from metrics import timeline
+from telemetry.core import wpr_modes
 from telemetry import decorators
-from telemetry.core import wpr_modes
-from telemetry.web_perf.metrics.layout import LayoutMetric
 from telemetry.unittest_util import options_for_unittests
 from telemetry.unittest_util import page_test_test_case
+from telemetry.web_perf.metrics.layout import LayoutMetric
+
+from measurements import smoothness_unittest
+from measurements import thread_times
+from metrics import timeline
 
 
 class ThreadTimesUnitTest(page_test_test_case.PageTestTestCase):
   def setUp(self):
     self._options = options_for_unittests.GetCopy()
     self._options.browser_options.wpr_mode = wpr_modes.WPR_OFF
 
   @decorators.Disabled('android')
   def testBasic(self):
     ps = self.CreatePageSetFromFileInUnittestDataDir('scrollable_page.html')
@@ skipping 35 matching lines @@
 
     main_thread = "renderer_main"
     expected_trace_categories = ["blink", "cc", "idle"]
     for trace_category in expected_trace_categories:
       value_name = timeline.ThreadDetailResultName(main_thread, trace_category)
       values = results.FindAllPageSpecificValuesNamed(value_name)
       self.assertEquals(len(values), 1)
 
   def testCleanUpTrace(self):
     self.TestTracingCleanedUp(thread_times.ThreadTimes, self._options)