Re: [w3c/manifest] Way to detect if a web app is installed (Issue #1092)

`navigator.standalone` is true if you're in an app window, no matter the display mode. So for 'minimal-ui', 'standalone', etc. Also, importantly, true if the app is fullscreen. It's not the best name, but it's already shipped in WebKit, so... not terrible. We could do `navigator.installed` instead, but I'm fine with not doing that.

The meaning is that the web contents is in an app window. @marcoscaceres we should clarify what frames can see this. I think navigator.standalone is only top level? I'm embarrassingly ignorant of the iframe terminology, but I think there is a concept of a more trusted iframe vs a less trusted one, and I would hope that these are populated for the trusted but not the untrusted.

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