Add cacheName support. (#9)

With this change, cacheName is supported.  It means that if there is
multiple cache storage and developers want to choose which storage to
use, they can specify the storage by cacheName.

docs/index.bs

@@ -1571,8 +1571,14 @@ spec: storage; urlPrefix: https://storage.spec.whatwg.org/
         sequence<RouterCondition> _or;
       };
 
+      typedef (RouterSourceDict or RouterSourceEnum) RouterSource;
+
+      dictionary RouterSourceDict {
+        DOMString cacheName;
+      };
+
       enum RunningStatus { "running", "not-running" };
-      enum RouterSource { "cache", "fetch-event", "network" };
+      enum RouterSourceEnum { "cache", "fetch-event", "network" };
     </pre>
 
     <section>
@@ -1588,7 +1594,7 @@ spec: storage; urlPrefix: https://storage.spec.whatwg.org/
         1.  For each |rule| of |rules|:
             1. If running [=Verify Router Condition=] algorithm with |rule|["{{RouterRule/condition}}"] and |serviceWorker| returns false, [=throw=] a {{TypeError}}.
             1. Append |rule| to |routerRules|.
-        1. If |routerRules| [=list/contains=] a {{RouterRule}} whose {{RouterRule/source}} is "{{RouterSource/fetch-event}}" and |serviceWorker|'s [=set of event types to handle=] does not [=set/contain=] {{ServiceWorkerGlobalScope/fetch!!event}}, [=throw=] a {{TypeError}}.
+        1. If |routerRules| [=list/contains=] a {{RouterRule}} whose {{RouterRule/source}} is "{{RouterSourceEnum/fetch-event}}" and |serviceWorker|'s [=set of event types to handle=] does not [=set/contain=] {{ServiceWorkerGlobalScope/fetch!!event}}, [=throw=] a {{TypeError}}.
         1. Set |serviceWorker|'s [=service worker/list of router rules=] to |routerRules|.
 
     </section>
@@ -3136,15 +3142,18 @@ spec: storage; urlPrefix: https://storage.spec.whatwg.org/
       1. Let |activeWorker| be |registration|'s <a>active worker</a>.
       1. If |activeWorker|'s [=service worker/list of router rules=] is [=list/is not empty=]:
           1. Let |source| be the result of running [=Get Router Source=] algorithm with |registration|'s <a>active worker</a> and |request|.
-          1. If |source| is {{RouterSource/"network"}}, return null.
-          1. Else if |source| is {{RouterSource/"cache"}}, then:
-              1. Let |requestResponses| be the result of running [=Query Cache=] with |request|.
-              1. If |requestResponses| is an empty [=list=], return null.
-              1. Else:
-                  1. Let |requestResponse| be the first element of |requestResponses|.
-                  1. Let |response| be |requestResponse|'s response.
-                  1. If |client| is not null, |response|'s [=response/type=] is "`opaque`", and [=cross-origin resource policy check=] with |request|'s [=request/origin=], |client|, "", and |response|'s [=filtered response/internal response=] returns <b>blocked</b>, then return null.
-                  1. Return |response|.
+          1. If |source| is {{RouterSourceEnum/"network"}}, return null.
+          1. Else if |source| is {{RouterSourceEnum/"cache"}}, or |source|["{{RouterSourceDict/cacheName}}"] [=map/exists=], then:
+              1. [=map/For each=] |cacheName| &#x2192; |cache| of the [=relevant name to cache map=]:
+                  1. If |source|["{{RouterSourceDict/cacheName}}"] [=map/exists=] and |source|["{{RouterSourceDict/cacheName}}"] does not match |cacheName|, [=continue=].
+                  1. Let |requestResponses| be the result of running [=Query Cache=] with |request|, a new {{CacheQueryOptions}}, and |cache|.
+                  1. If |requestResponses| is an empty [=list=], return null.
+                  1. Else:
+                      1. Let |requestResponse| be the first element of |requestResponses|.
+                      1. Let |response| be |requestResponse|'s response.
+                      1. If |client| is not null, |response|'s [=response/type=] is "`opaque`", and [=cross-origin resource policy check=] with |request|'s [=request/origin=], |client|, "", and |response|'s [=filtered response/internal response=] returns <b>blocked</b>, then return null.
+                      1. Return |response|.
+              1. Return null.
       1. If |request| is a <a>non-subresource request</a>, |request| is a [=navigation request=], |registration|'s [=navigation preload enabled flag=] is set, |request|'s [=request/method=] is \`<code>GET</code>\`, |registration|'s [=active worker=]'s [=set of event types to handle=] [=set/contains=] <code>fetch</code>, and |registration|'s [=active worker=]'s [=all fetch listeners are empty flag=] is not set then:
 
           Note: If the above is true except |registration|'s [=active worker=]'s <a>set of event types to handle</a> **does not** contain <code>fetch</code>, then the user agent may wish to show a console warning, as the developer's intent isn't clear.