Bug 1526506 [wpt PR 14974] - Update wpt metadata, a=testonly

wpt-pr: 14974
wpt-type: metadata

testing/web-platform/meta/portals/portals-host-exposure.sub.html.ini

@@ -0,0 +1,11 @@
+[portals-host-exposure.sub.html]
+  expected: TIMEOUT
+  [window.portalHost should be exposed in same-origin portal]
+    expected: TIMEOUT
+
+  [window.portalHost should be exposed in cross-origin portal]
+    expected: NOTRUN
+
+  [window.portalHost should be exposed in portal after cross-origin navigation]
+    expected: NOTRUN
+