Re: [w3c/permissions] Define a permission store (closes #384) (PR #390)

@johannhof commented on this pull request.



> +          The user agent maintains a single <dfn class="export">permission store</dfn> which is a [=/list=] of [=permission store entries=].
+        </p>
+        <p>
+          The user agent MAY remove [=entries=] from the [=permission store=] when their respective [=permission=]'s [=permission/lifetime=] has expired.
+        </p>
+        <p>
+          A <dfn class="export" data-local-lt="entry">permission store entry</dfn> is a [=tuple=] of {{PermissionDescriptor}} <dfn class="export" data-dfn-for="permission store entry">descriptor</dfn>, [=permission key=] <dfn class="export" data-dfn-for="permission store entry">key</dfn>, and [=permission/state=] <dfn class="export" data-dfn-for="permission store entry">state</dfn>.
+        </p>
+        <p>
+        To <dfn class="export">get a permission store entry</dfn> given a {{PermissionDescriptor}} |descriptor| and [=permission key=] |key|, run these steps:
+          <ol class="algorithm">
+            <li>
+              If the user agent's [=permission store=] [=list/contains=] an [=entry=] whose [=permission store entry/descriptor=] is |descriptor|, and whose [=permission store entry/key=] [=permission key/is equal to=] |key| given |descriptor|, return that entry.
+            </li>
+            <li>
+              Return null.

Hmm, that's an interesting question. I think returning null here is really to be explicit that there's no entry, and I figured that defaulting to "prompt" (or something else) would be done when computing the permission state when there's no explicit entry in the store (e.g. in step 8 [here](https://pr-preview.s3.amazonaws.com/johannhof/permissions/pull/390.html#dfn-permission-state))

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