Re: [w3c/manifest] Add id member to manifest (#988)

@marcoscaceres commented on this pull request.



> +        application. When the user agent sees a manifest with an |identity|
+        matching that of an already-installed application, it SHOULD be used as
+        a signal that this manifest is a replacement for the already-installed
+        application's manifest, and not a distinct application, even if it is
+        served from a different URL than the one seen previously.
+        </p>
+        <p>
+          The |identity| MAY be used by a service that collects lists of web
+          applications to uniquely identify applications.
+        </p>
+        <p>
+          To <dfn>process the `id` member</dfn>, given [=object=]
+          |json:JSON|, [=ordered map=] |manifest:ordered map|:
+        </p>
+        <ol class="algorithm">
+          <li>Set |manifest|["id"] to |manifest|["start_url"].

I think we might have another issue here: `start_url` might be `undefined`. 

We would need to assure that `start_url` is always assured for this to work. In that case, the document's URL would again need to be the `start_url`. 

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