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Extracts the NTP tiles into UIView subclasses that can be used outside
of the NTP-related collection views.

Bug: none
Cq-Include-Trybots: luci.chromium.try:ios-simulator-cronet;luci.chromium.try:ios-simulator-full-configs
Change-Id: I534e54f5bdf23592d43baa035a14327563ee7751
Reviewed-on: https://chromium-review.googlesource.com/c/1278985Reviewed-by: Mark Cogan <marq@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#600424}