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Added calls to android DownloadManager (AddCompletedDownload and
RemoveCompletedDownload) from native offline content provider.
Also added a feature to selectively disable the native path for now.

Bug: 933854
Change-Id: I178ab17063f6914b523219c308a6abaa3133452c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1422747
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: 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@{#637907}