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Fixups include:
* Additional documentation on what is being tested.
* Removal of duplicate test cases.
* Removal of test parameters that were not being exercised.

Bug: 828038
Change-Id: I2ec965c72c0872b402b92914863e4afa26de6ebc
Reviewed-on: https://chromium-review.googlesource.com/990957
Commit-Queue: Asanka Herath <asanka@chromium.org>
Reviewed-by: Matt Menke <mmenke@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547703}