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Add the class structure required to support the actual View in the new
download home code layout.  This adds the required adapters, model
change processors, view binders, etc..  Currently they all just inflate
to a TextView, but this is the rough structure the code will be in as
the Views get built out.

BUG=842345

Change-Id: I385ab70a7537254832f57ccb410bb75498a99545
Reviewed-on: https://chromium-review.googlesource.com/1072947
Commit-Queue: David Trainor <dtrainor@chromium.org>
Reviewed-by: Min Qin <qinmin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#562050}