Fix markupsafe pydeps import issue.

build/android/pylib/local/device/local_device_instrumentation_test_run.py

Index: build/android/pylib/local/device/local_device_instrumentation_test_run.py
diff --git a/build/android/pylib/local/device/local_device_instrumentation_test_run.py b/build/android/pylib/local/device/local_device_instrumentation_test_run.py
index 0231304b3b2e06413deea7d614f9c9850ea801dd..6252d7670acf91450ad44b8993bf6d2b7a7e93fb 100644
--- a/build/android/pylib/local/device/local_device_instrumentation_test_run.py
+++ b/build/android/pylib/local/device/local_device_instrumentation_test_run.py
@@ -6,7 +6,6 @@ import logging
 import os
 import posixpath
 import re
-import sys
 import tempfile
 import time
 
@@ -29,9 +28,10 @@ from py_utils import contextlib_ext
 from py_utils import tempfile_ext
 import tombstones
 
-sys.path.append(os.path.join(host_paths.DIR_SOURCE_ROOT, 'third_party'))
-import jinja2  # pylint: disable=import-error
-import markupsafe  # pylint: disable=import-error,unused-import
+with host_paths.SysPath(
+    os.path.join(host_paths.DIR_SOURCE_ROOT, 'third_party'), 1):

[Nico, 2017/05/19 16:03:43]

Why is this better than just sys.path.insert(0, ...) (which we use all over the
place and which people can understand without having to read
host_paths.SysPath())?

+  import jinja2  # pylint: disable=import-error
+  import markupsafe  # pylint: disable=import-error,unused-import
 
 
 _JINJA_TEMPLATE_DIR = os.path.join(