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A permission descriptor is a structure describing a permission that an
origin may request. Most permissions are only identified by their names
but some have additional parameters. For example, a Bluetooth device
permission may include the MAC address of the device (or other unique
identifier) so that the permission applies to only the device selected
by the user through some sort of chooser interface.

BUG=638721

Review-Url: https://codereview.chromium.org/2255933002
Cr-Commit-Position: refs/heads/master@{#422744}