Pointer input source items are not updated in the spec text

[OrKoN]

https://www.w3.org/TR/webdriver2/#pointer-input-source defines subtype, pointerId, x and y items.

When dispatching actions those attributes are used but it does not look like they are ever updated. They are also used to resolve the pointer origin to coordinates in https://www.w3.org/TR/webdriver2/#dfn-get-coordinates-relative-to-an-origin and since x/y are not updated it is not clear if it should always be relative to 0,0.

I have not double checked subtype and pointerId in details but it does not seem they are every updated either.

[whimboo]

Note that subtype and pointerId should probably never be updated given that both identify a given input source and its type which we should not be able to change.