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Creates a TableContainerViewController that contains a ChromeTableViewController.
Adds it to showcase.

Screenshot:
https://drive.google.com/open?id=1kCC5xDoreepzp2Y-uQmVUxMUP_Vae_Y_


Bug: 805013
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I5f5d58eab32a8c13cbcc8ed32f4a6d5cbc7b7598
Reviewed-on: https://chromium-review.googlesource.com/923408
Commit-Queue: Sergio Collazos <sczs@chromium.org>
Reviewed-by: Rohit Rao <rohitrao@chromium.org>
Cr-Commit-Position: refs/heads/master@{#537805}