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This is the second step in a series of CLs for moving the
AddToHomescreen component to MVC in Android.

In this CL view classes are added and hooked up. A subsequent CL will
add the coordinator, mediator, and installer classes.

Design doc: http://go/a2hs-mvc

Bug: 994759
Change-Id: I3dbe02a14c5966986a483c4ba68f60f492a52d61
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1793633
Commit-Queue: Mehran Mahmoudi <mahmoudi@chromium.org>
Reviewed-by: Matthew Jones <mdjones@chromium.org>
Reviewed-by: Dominick Ng <dominickn@chromium.org>
Reviewed-by: Peter Kotwicz <pkotwicz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#701347}