Re: [w3c/ServiceWorker] consider firing a "clientcontrolled" event on ServiceWorkerGlobalScope (#886)

Here are some other cases where a `clientcontrolled` event would be useful.  Currently we can create controlled clients without a FetchEvent in a number of ways:

1. about:blank or about:srcdoc iframes inheriting the controller from its parent
2. blob: URL frames and workers
3. document.open() creates a new global and inherits the controller like about:blank frames (currently only implemented in firefox, but the spec agrees)

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