Fix import order with isort tool.

tools/telemetry/telemetry/timeline/thread.py

Index: tools/telemetry/telemetry/timeline/thread.py
diff --git a/tools/telemetry/telemetry/timeline/thread.py b/tools/telemetry/telemetry/timeline/thread.py
index f6e7d08b53a9df2ec49326fad5da759ec3c303a5..ce8151e0c283e6a575d90d88e8672c0faf02f6fb 100644
--- a/tools/telemetry/telemetry/timeline/thread.py
+++ b/tools/telemetry/telemetry/timeline/thread.py
@@ -1,12 +1,13 @@
 # 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.
-import telemetry.timeline.event_container as event_container
-import telemetry.timeline.sample as sample_module
 import telemetry.timeline.async_slice as async_slice_module
+import telemetry.timeline.event_container as event_container
 import telemetry.timeline.flow_event as flow_event_module
+import telemetry.timeline.sample as sample_module
 import telemetry.timeline.slice as slice_module
 
+
 class Thread(event_container.TimelineEventContainer):
   ''' A Thread stores all the trace events collected for a particular
   thread. We organize the synchronous slices on a thread by "subrows," where