Adds a 'MORE' menu to the file list, next to the edit button. As it
exists right now, some of the actions that exist on a file may be
invalid (e.g. allowing "delete" on a file that is already deleted) --
using these actions will result in a server error, but are otherwise a
no-op.
TODO:
- Add tooltip prop to GrEditConstants.Actions
- Disable some actions for some files, based on status
Bug: Issue 4437
Change-Id: I313906ddff03121eb50472433390c15859c059aa
c64632cb3f