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

build/inverse_depth.py

Index: build/inverse_depth.py
diff --git a/build/inverse_depth.py b/build/inverse_depth.py
new file mode 100755
index 0000000000000000000000000000000000000000..ce7a6abb68a6ef9cee80ad373c5c2936b1edf85f
--- /dev/null
+++ b/build/inverse_depth.py
@@ -0,0 +1,24 @@
+#!/usr/bin/env python
+# 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.
+
+import os
+import sys
+
+
+def DoMain(argv):
+  depth = argv[0]
+  return os.path.relpath(os.getcwd(), os.path.abspath(depth))
+
+
+def main(argv):
+  if len(argv) < 2:
+    print "USAGE: inverse_depth.py depth"
+    return 1
+  print DoMain(argv[1:])
+  return 0
+
+
+if __name__ == '__main__':
+  sys.exit(main(sys.argv))