ServiceWorker polyfill Fetch implementation.

Source/modules/serviceworkers/polyfills/cachePolyfill.js

 /*
  * Copyright (C) 2014 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 64 matching lines @@
             }
 
             var entriesByUrl = entriesByMethod[request.method];
             entriesByUrl[request.url] = response;
 
             resolve();
         });
     };
 
     Cache.prototype.add = function(request) {
-        // FIXME: Implement this.
+        var scope = this;
+        request = _castToRequest(request);

[jsbell, 2014/06/05 17:48:02]

_castToRequest isn't exposed, and you probably want the fetch() impl to do this
anyway?

[jsbell, 2014/06/05 17:50:50]

Ah, sorry, I didn't see that there was a local copy of this in this polyfill.

         return new Promise(function (resolve, reject) {
-            reject("Cache.add not implemented.");
+            Fetch(request).then(
+                function(response) {
+                    scope.set(request, response).then(resolve);
+                },
+                reject);
         });
     };
 
     Cache.prototype.delete = function(request) {
         request = _castToRequest(request);
 
         var entriesByMethod = this.entriesByMethod;
         return new Promise(function (resolve, reject) {
             var entriesByUrl = entriesByMethod[request.method];
 
@@ skipping 21 matching lines @@
             var entry = entriesByUrl[request.url];
             if (entry == undefined) {
                 reject("not found");
             }
             resolve(entry);
         });
     };
 
     return Cache;
 })();