Update from https://crrev.com/303153

build/android/pylib/base/test_run.py

Index: build/android/pylib/base/test_run.py
diff --git a/build/android/pylib/base/test_run.py b/build/android/pylib/base/test_run.py
new file mode 100644
index 0000000000000000000000000000000000000000..2c594fdd61b27460436ba1cc55039dc40642633a
--- /dev/null
+++ b/build/android/pylib/base/test_run.py
@@ -0,0 +1,39 @@
+# 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.
+
+
+class TestRun(object):
+  """An execution of a particular test on a particular device.
+
+  This is expected to handle all logic that is specific to the combination of
+  environment and test type.
+
+  Examples include:
+    - local gtests
+    - local instrumentation tests
+  """
+
+  def __init__(self, env, test_instance):
+    self._env = env
+    self._test_instance = test_instance
+
+  def TestPackage(self):
+    raise NotImplementedError
+
+  def SetUp(self):
+    raise NotImplementedError
+
+  def RunTest(self):
+    raise NotImplementedError
+
+  def TearDown(self):
+    raise NotImplementedError
+
+  def __enter__(self):
+    self.SetUp()
+    return self
+
+  def __exit__(self, exc_type, exc_val, exc_tb):
+    self.TearDown()
+