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We need to show separate empty views for downloads and prefetch tabs. Also
on prefetch tab, the message will be different if prefetch is disabled.
Added EmptyViewCoordinator which will supply the empty view to the
DecoratedListItemModel. The exact UI for views will be added later.

Bug: 850607
Change-Id: If7c40d1964a7b13f92e272d632493f5c23749f57
Reviewed-on: https://chromium-review.googlesource.com/1144458
Commit-Queue: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#577071}