Add portals (defer)

Closes mozilla#157.

activities.json

@@ -626,6 +626,18 @@
     "title": "Picture-in-Picture",
     "url": "https://wicg.github.io/picture-in-picture/"
   },
+  {
+    "ciuName": null,
+    "description": "This specification defines a mechanism that allows for rendering of, and seamless navigation to, embedded content.",
+    "id": "portals",
+    "mozBugUrl": null,
+    "mozPosition": "defer",
+    "mozPositionDetail": "While we are deferring evaluation of this proposal, because per <a href=\"https://github.com/mozilla/standards-positions/issues/157#issuecomment-636217042\">Domenic's comment</a> it is in the early stages of development and it is too early to evaluate fully, there are concerns (serious enough to mark it as harmful) that we would like to see addressed as it develops.  Most significantly, it needs to explain its interaction with the Web's storage mechanisms in a way that doesn't contribute to third-party tracking or reduce the effectiveness of proposals designed to mitigate such tracking (such as those that partition storage based on toplevel origins).  It also needs to justify the (still undetermined) amount of complexity that it adds to the web platform with sufficiently valuable use cases to justify that complexity.",
+    "mozPositionIssue": 157,
+    "org": "Proposal",
+    "title": "Portals",
+    "url": "https://wicg.github.io/portals/"
+  },
   {
     "ciuName": null,
     "description": "Powerful web applications would like to exchange data with native applications via the OS clipboard (copy-paste). The existing Web Platform has a high-level API that supports the most popular standardized data types (text, image, rich text) across all platforms. However, this API does not scale to the long tail of specialized formats. In particular, non-web-standard formats like TIFF (a large image format), and proprietary formats like .docx (a document format), are not supported by the current Web Platform. Raw Clipboard Access aims to provide a low-level API solution to this problem, by implementing copying and pasting of data with any arbitrary Clipboard type, without encoding and decoding.",