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This CL takes care of the boilerplate to pass upload data along.
The DownloadService will go through the Data Manager and get the request
body if the request is an upload.

Bug: 1329149
Change-Id: I8ae6664f7b0fe2735451cc5ddf14faa3562c00e1
Reviewed-on: https://chromium-review.googlesource.com/c/1329622
Commit-Queue: Rayan Kanso <rayankans@chromium.org>
Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Peter Beverloo <peter@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609309}