Add an option to include frozen documents.

It is off by default to exclude them when frozen. Since postMessage
will be delayed until the page is unfrozen this is the safest option
to exclude frozen pages by default.

Author: dtapuska

docs/index.bs

@@ -66,6 +66,9 @@ spec: page-visibility; urlPrefix: https://www.w3.org/TR/page-visibility/
     type: enum; text: VisibilityState; url: VisibilityState
     type: attribute; text: visibilityState; for: Document; url: dom-document-visibilitystate
 
+spec: page-lifecycle; urlPrefix: https://wicg.github.io/page-lifecycle/spec.html
+    type: dfn; text: frozen; url: frozen
+
 spec: html; urlPrefix: https://html.spec.whatwg.org/multipage/
     type: attribute
         urlPrefix: comms.html
@@ -1207,6 +1210,7 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
     <pre class="idl" id="serviceworker-client-query-options-dictionary">
       dictionary ClientQueryOptions {
         boolean includeUncontrolled = false;
+        boolean includeFrozen = false;
         ClientType type = "window";
       };
     </pre>
@@ -1248,6 +1252,7 @@ spec: webappsec-referrer-policy; urlPrefix: https://w3c.github.io/webappsec-refe
                 1. If |client|'s [=environment/execution ready flag=] is unset or |client|'s [=discarded flag=] is set, [=continue=].
                 1. If |client| is not a [=secure context=], [=continue=].
                 1. If |options|["{{ClientQueryOptions/includeUncontrolled}}"] is false, and if |client|'s [=active service worker=] is not the associated [=ServiceWorkerGlobalScope/service worker=], [=continue=].
+                1. If |options|["{{ClientQueryOptions/includeFrozen}}"] is false, |client| is a window client and |client|'s [=responsible document=] is [=frozen=], [=continue=].
                 1. Add |client| to |targetClients|.
             1. Let |matchedWindowData| be a new [=list=].
             1. Let |matchedClients| be a new [=list=].