Add copy of create_updated_flutter_deps.py from fluter/buildroot

The monorepo DEPS is created by running this script, and then making
some additional changes to let the DEPS check out pinned versions
of Dart, Flutter engine, and Flutter framework.

Copying the script without changes will make it easier to merge later
changes made in the source of the copy.
1 file changed
tree: 486061584719dd8858832d1fdba3615b79fc9bb7
  1. tools/
  2. .gitignore
  3. commits.json
  4. DEPS