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Added Coordinator, coordinaor implementation, view classes.
Added layout file.

Bug: 1053740
Change-Id: Iabb9370888822f643539cbd6b2e8398f3bcafb7c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2063748
Commit-Queue: Tina Wang <tinazwang@chromium.org>
Reviewed-by: sebsg <sebsg@chromium.org>
Cr-Commit-Position: refs/heads/master@{#742837}