GitLab

This adds the referrer, extra http headers and the upload data stream
to the sub request

Bug: 110888390
Test: None
Change-Id: I66c18e8671ea61dd6078ec871da0b19f72c12589
Reviewed-on: https://chromium-review.googlesource.com/1134035Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Commit-Queue: Albert Chaulk <achaulk@chromium.org>
Cr-Commit-Position: refs/heads/master@{#579119}