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Adjust the permissions packing code in the chrome.permissions extension
API to include scriptable hosts, as well as explicit hosts. This will
result in permissions.getAll() returning origins that are specified in
the content_scripts section of the manifest, in addition to the hosts
specified in the permissions key.

Update tests for the same.

Bug: 889654
Change-Id: I5dba0bc225bdcb30b969f48f9405f92b1ec8bd58
Reviewed-on: https://chromium-review.googlesource.com/c/1347441Reviewed-by: Karan Bhatia <karandeepb@chromium.org>
Commit-Queue: Devlin <rdevlin.cronin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612376}