sandwich: Implement SandwichTaskBuilder

tools/android/loading/common_util.py

 # Copyright (c) 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.
 
 import contextlib
 import json
 import logging
 import os
 import re
 import shutil
@@ skipping 71 matching lines @@
 @contextlib.contextmanager
 def TemporaryDirectory():
   """Returns a freshly-created directory that gets automatically deleted after
   usage.
   """
   name = tempfile.mkdtemp()
   try:
     yield name
   finally:
     shutil.rmtree(name)
+
+
+def EnsureParentDirectoryExists(path):
+  """Verifies that the parent directory exists or creates it if missing."""
+  parent_directory_path = os.path.abspath(os.path.dirname(path))
+  if not os.path.isdir(parent_directory_path):
+    os.makedirs(parent_directory_path)