[telemetry] Sort imports in Telemetry and its dependents.

tools/perf/measurements/thread_times.py

Index: tools/perf/measurements/thread_times.py
diff --git a/tools/perf/measurements/thread_times.py b/tools/perf/measurements/thread_times.py
index ab0bbd92af6892baaca97ade66e8370f51cc048f..6b517d0604602e7f5403df9ae672a3c0c1dd91aa 100644
--- a/tools/perf/measurements/thread_times.py
+++ b/tools/perf/measurements/thread_times.py
@@ -1,12 +1,15 @@
 # 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 timeline_controller
-from metrics import timeline
+
 from telemetry.core.platform import tracing_category_filter
 from telemetry.page import page_test
 from telemetry.web_perf.metrics import layout
 
+from measurements import timeline_controller
+from metrics import timeline
+
+
 class ThreadTimes(page_test.PageTest):
   def __init__(self, report_silk_details=False):
     super(ThreadTimes, self).__init__()