Re: [w3c/permissions] A more modest request() (#158)

@raymeskhoury 
With respect to item 4, how do you think that should work for clipboard?

We have `navigator.clipboard`, so that people can call `clipboard.read()` and `clipboard.write()` and have the permissions checked just before the resource is accessed. These methods would request `read` and `write` clipboard access, respectively, as needed.

But we also need a way to request `full` access[1], and since there is no clipboard API that requires `full` access, it would need to be done in some sort of `clipboard.request()` method.

But I don't think it makes sense for this `clipboard.request` method to return a handle to a resource. Would it just return `navigator.clipboard`? Because returning a handle like this implies that the handle defines the scope of the access, which would not be true in this case.

And if we remove `navigator.clipboard` and require that a clipboard handle be requested beforehand, then that undermines the model that @martinthomson discusses in #83.

My preference is for there to be a `clipboard.request()`, but I don't think it makes sense for it to return a handle to the clipboard.

[1] Note: `full` clipboard access would grant read/write clipboard access without requiring a user gesture.

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