Revert of Remove catapult_base from telemetry.

tools/telemetry/catapult_base/refactor/__init__.py

+# Copyright 2015 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.
+
+"""Style-preserving Python code transforms.
+
+This module provides components for modifying and querying Python code. They can
+be used to build custom refactorings and linters.
+"""
+
+import functools
+import multiprocessing
+
+# pylint: disable=wildcard-import
+from catapult_base.refactor.annotated_symbol import *
+from catapult_base.refactor.module import Module
+
+
+def _TransformFile(transform, file_path):
+  module = Module(file_path)
+  result = transform(module)
+  module.Write()
+  return result
+
+
+def Transform(transform, file_paths):
+  transform = functools.partial(_TransformFile, transform)
+  return multiprocessing.Pool().map(transform, file_paths)