Add --auto-update flag which uploads committed CL and initiates the CQ

The --auto-update flag is meant to provide the functionality of uploading a CL and initiating CQ to a bot for the automatic importing of w3c tests.

BUG=621599

Review-Url: https://codereview.chromium.org/2107993002
Cr-Commit-Position: refs/heads/master@{#404309}
2 files changed