Re: [slightlyoff/ServiceWorker] Add cache.name property (#869)

At face value this looks easy, but its possible to have a Cache objects that is not in CacheStorage under any name.  Today you can get this with:

```
var cache;
caches.open('foo').then(function(c) {
  cache = c;
  return caches.delete('foo');
}).then(function() {
  // cache exists and is usable, but not stored under a name any more
});
```

Also, we have discussed allowing Cache objects to be constructed without CacheStorage.  Something like `new Cache()` would not have a name in CacheStorage either.  It also seems like renaming Cache objects could be possible in the future.

I would be more in favor of adding a way to query the name of a particular Cache object.  Something like `caches.getNameFor(cache).then(function(name) { /* use name */ })`.

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