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* Restructure document to be a simple overview + functional information (i.e. how do I X).
* Remove discussion of implementation details (WPR, TBM, etc.)
  that are covered in child documents.
* Add discussion on how to create a test.

Change-Id: Id60882846b15aa557620d23516a1584f2ff62cea
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2450715
Commit-Queue: Ryan Heise <heiserya@google.com>
Auto-Submit: Ryan Heise <heiserya@google.com>
Reviewed-by: John Chen <johnchen@chromium.org>
Cr-Commit-Position: refs/heads/master@{#814019}