Add support for Junit tests in platform mode.

build/android/pylib/local/machine/local_machine_environment.py

Index: build/android/pylib/local/machine/local_machine_environment.py
diff --git a/build/android/pylib/local/machine/local_machine_environment.py b/build/android/pylib/local/machine/local_machine_environment.py
new file mode 100644
index 0000000000000000000000000000000000000000..b9f6acad37aace6bff804aa5edb56a3d93fe2017
--- /dev/null
+++ b/build/android/pylib/local/machine/local_machine_environment.py
@@ -0,0 +1,19 @@
+# Copyright 2016 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 pylib.base import environment
+
+
+class LocalMachineEnvironment(environment.Environment):
+
+  def __init__(self, _args, _error_func):
+    super(LocalMachineEnvironment, self).__init__()
+
+  #override
+  def SetUp(self):
+    pass
+
+  #override
+  def TearDown(self):
+    pass