Re: [w3c/permissions] Add 'display' permission for screen-capture. (#184)

jan-ivar commented on this pull request.



> +  <section>
+    <h3 id="screen-capture">
+      Screen Capture
+    </h3>
+    <p>
+      The <dfn for="PermissionName" enum-value>"display"</dfn>
+      permission is the permission associated with the usage of
+      [[screen-capture]].
+    </p>
+    <dl>
+      <dt>
+        <a>permission state constraints</a>
+      </dt>
+      <dd>
+        Valid values for this descriptor's <a>permission state</a> are
+        {{"prompt"}} and {{"denied"}}. The user agent MUST NOT ever set this

The [spec prose](https://w3c.github.io/mediacapture-screen-share/#dom-navigator-getdisplaymedia) is already pretty clear, saying: *"The user agent MUST let the end-user choose which display surface to share out of all available choices every time"*.

Adding this language here is necessary to for that spec to call this spec's [prompt the user to choose ](https://w3c.github.io/permissions/#prompt-the-user-to-choose) algorithm, since that algorithm is not guaranteed to prompt the user otherwise. 

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