Fix import order with isort tool.

tools/telemetry/telemetry/core/bitmap_unittest.py

Index: tools/telemetry/telemetry/core/bitmap_unittest.py
diff --git a/tools/telemetry/telemetry/core/bitmap_unittest.py b/tools/telemetry/telemetry/core/bitmap_unittest.py
index 8613b141729b29fb53cd4be257e2b49ed40e8795..b24900e9a3ba191edcb4fa5406f75deb7114152b 100644
--- a/tools/telemetry/telemetry/core/bitmap_unittest.py
+++ b/tools/telemetry/telemetry/core/bitmap_unittest.py
@@ -2,15 +2,14 @@
 # Use of this source code is governed by a BSD-style license that can be
 # found in the LICENSE file.
 
-import tempfile
 import os
+import tempfile
 import unittest
 
 from telemetry import benchmark
 from telemetry.core import bitmap
 from telemetry.core import util
 
-
 # This is a simple base64 encoded 2x2 PNG which contains, in order, a single
 # Red, Yellow, Blue, and Green pixel.
 test_png = """