We'd love to accept your patches and contributions to this project. There are just a few small guidelines you need to follow.
Contributions to this project must be accompanied by a Contributor License Agreement. You (or your employer) retain the copyright to your contribution, this simply gives us permission to use and redistribute your contributions as part of the project. Head over to https://cla.developers.google.com/ to see your current agreements on file or to sign a new one.
You generally only need to submit a CLA once, so if you've already submitted one (even if it was for a different project), you probably don't need to do it again.
One way to ensure that your PR will be accepted is to add functionality that has been requested in GitHub issues. If there is something you think is important and we're missing it but does not show up in GitHub issues, it would be good to file an issue there first so we can have the discussion before sending us a PR.
All submissions, including submissions by project members, require review. We use GitHub pull requests for this purpose. Consult GitHub Help for more information on using pull requests.
We require unit tests for most code, instructions for running our unit test suites are in the documentation.