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

build/android/pylib/base/environment_factory.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.
+
+from pylib import constants
+from pylib.local.device import local_device_environment
+from pylib.remote.device import remote_device_environment
+
+def CreateEnvironment(args, error_func):
+
+  if args.environment == 'local':
+    if args.command not in constants.LOCAL_MACHINE_TESTS:
+      return local_device_environment.LocalDeviceEnvironment(args, error_func)
+    # TODO(jbudorick) Add local machine environment.
+  if args.environment == 'remote_device':
+    return remote_device_environment.RemoteDeviceEnvironment(args,
+                                                             error_func)
+  error_func('Unable to create %s environment.' % args.environment)