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This implements the CategoryView, showing all contacts in a list,
allowing for selection and reporting back.

Bug: 860467
Change-Id: I83d7e068ab7e2c6cd97631f9f79204042c49bd77
Reviewed-on: https://chromium-review.googlesource.com/1172787
Commit-Queue: Finnur Thorarinsson <finnur@chromium.org>
Reviewed-by: Becky Zhou <huayinz@chromium.org>
Reviewed-by: Theresa <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#583221}