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This CL implements a code path to make Java side known how OfflineItem
should be resumed.

OfflineItemState::FAILED: Cannot resume, no further user actions.

OfflineItemState::INTERRUPTED: Can resume, but need to restart from
beginning. Should hook to retry button.

OfflineItemState::PENDING/PAUSE still uses
DownloadUtils.isDownloadPending/isDownloadPause, when download can be
resumed in the middle.


Bug: 895018,895013
Change-Id: I36a82cf3754093bfab85a623818d9e2392a6fc73
Reviewed-on: https://chromium-review.googlesource.com/c/1289677
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: David Trainor <dtrainor@chromium.org>
Cr-Commit-Position: refs/heads/master@{#601713}