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Add support for extensions requesting content script permissions in the
permissions API. This allows extensions to request withheld content
script permissions through chrome.permissions.request().

Add tests to cover the same.

Bug: 889654
Change-Id: I0b77215ec154e42d1152df3277307d0383cda204
Reviewed-on: https://chromium-review.googlesource.com/c/1347061Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#611945}