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

build/android/pylib/utils/zip_utils.py

Index: build/android/pylib/utils/zip_utils.py
diff --git a/build/android/pylib/utils/zip_utils.py b/build/android/pylib/utils/zip_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..d799463f9042b8a99ae0da2dc88d5183164be2c4
--- /dev/null
+++ b/build/android/pylib/utils/zip_utils.py
@@ -0,0 +1,31 @@
+# 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.
+
+import logging
+import os
+import zipfile
+
+
+def WriteToZipFile(zip_file, path, arc_path):
+  """Recursively write |path| to |zip_file| as |arc_path|.
+
+  zip_file: An open instance of zipfile.ZipFile.
+  path: An absolute path to the file or directory to be zipped.
+  arc_path: A relative path within the zip file to which the file or directory
+    located at |path| should be written.
+  """
+  if os.path.isdir(path):
+    for dir_path, _, file_names in os.walk(path):
+      dir_arc_path = os.path.join(arc_path, os.path.relpath(dir_path, path))
+      logging.debug('dir:  %s -> %s', dir_path, dir_arc_path)
+      zip_file.write(dir_path, dir_arc_path, zipfile.ZIP_STORED)
+      for f in file_names:
+        file_path = os.path.join(dir_path, f)
+        file_arc_path = os.path.join(dir_arc_path, f)
+        logging.debug('file: %s -> %s', file_path, file_arc_path)
+        zip_file.write(file_path, file_arc_path, zipfile.ZIP_DEFLATED)
+  else:
+    logging.debug('file: %s -> %s', path, arc_path)
+    zip_file.write(path, arc_path, zipfile.ZIP_DEFLATED)
+