Set name parameter when saving file via Drydock

Summary: This sets the name parameter when Drydock uploads a file so that the storage engine picks it up correctly.

Test Plan: N/A

Reviewers: epriestley, Blessed Reviewers

Reviewed By: epriestley, Blessed Reviewers

Subscribers: epriestley, Korvin

Differential Revision: https://secure.phabricator.com/D8673