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With recent changes, the target path is not a content Uri if download
is written to a content Uri. This may cause some undesirable effect
for resumption.
We kept the target path earlier due to display names.
This Cl solves both issues by loading the display names from ContentResolver
on initialization time, and pass them to all the download items
so that could be used later. The target path will be changed to content Uri
once intermediate file rename completes.

TBR=dtrainor@chromium.org
BUG=931021

Change-Id: I36bf5245ea1f7d36aa707a4b0f1065a5b0f8b133
Reviewed-on: https://chromium-review.googlesource.com/c/1479934
Commit-Queue: Min Qin <qinmin@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#636738}