Re: [w3c/manifest] Add optional Transition Screen member (#478)

I agree that the best experience would be something that the developer invests in as part of her/his web app experience. 

However, we've had feedback from developers around their existing web apps loaded in an app host rather than the browser where they'd like a loading indicator to be displayed during navigation instead of a blank page. 

Often times the developer reverts to loading their web app in a webivew and placing custom platform UI on top during navigations. We've seen that the platform offered loading indicator is enough almost all the time.

Our thought was to have the app host show the loading indicator automatically if the developer opted in through the manifest. It could be off by default and the manifest attribute would serve as a toggle.

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