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

build/android/pylib/utils/repo_utils.py

Index: build/android/pylib/utils/repo_utils.py
diff --git a/build/android/pylib/utils/repo_utils.py b/build/android/pylib/utils/repo_utils.py
new file mode 100644
index 0000000000000000000000000000000000000000..e0c7d2c255279e1871b617d3322867979fe16f28
--- /dev/null
+++ b/build/android/pylib/utils/repo_utils.py
@@ -0,0 +1,16 @@
+# Copyright (c) 2013 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 cmd_helper
+
+
+def GetGitHeadSHA1(in_directory):
+  """Returns the git hash tag for the given directory.
+
+  Args:
+    in_directory: The directory where git is to be run.
+  """
+  command_line = ['git', 'log', '-1', '--pretty=format:%H']
+  output = cmd_helper.GetCmdOutput(command_line, cwd=in_directory)
+  return output[0:40]