Add a snapshot of flutter/engine/src/build to our sdk

build/android/pylib/base/environment.py

+# 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 Environment(object):
+  """An environment in which tests can be run.
+
+  This is expected to handle all logic that is applicable to an entire specific
+  environment but is independent of the test type.
+
+  Examples include:
+    - The local device environment, for running tests on devices attached to
+      the local machine.
+    - The local machine environment, for running tests directly on the local
+      machine.
+  """
+
+  def __init__(self):
+    pass
+
+  def SetUp(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()
+