GitLab

This CL allows DownloadManagerService to create InProgressDownloadManager
under cirtain circumstances.
The created InProgressDownloadManager can be used to resume download
without launching full browser process. And can be passed to the
DownloadManager when the latter is created.

BUG=695115

Change-Id: I050c1e5f5247cc1550e59117f7943a66a71656ce
Reviewed-on: https://chromium-review.googlesource.com/c/1182613Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#596403}