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Refactor the permissions parsing in the chrome.permissions API in order
to separate out requested permissions into different fields, including
required permissions, optional permissions, and permissions that were
not specified in the manifest.

Add more robust testing for the permissions parsing code.

This CL is prework for subsequently adding support for requesting
withheld content script permissions through the permissions API. There
should be no behavior change as a result of this CL.

Bug: 889654
Change-Id: I22c1e057ccb259b4fcff4051923fc9c1128c8213
Reviewed-on: https://chromium-review.googlesource.com/c/1347310
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611846}