Re: [w3c/webcomponents] Selection APIs for Shadow DOM (#79)

Rough consensus at TPAC F2F:
 - Add `getComposedRange`, which takes a list of closed trees, to [`Selection`](https://w3c.github.io/selection-api/#dom-selection).
 - Instead of adding a new `setBaseAndExtent` variant, update the existing methods to support setting selection which crosses shadow boundaries.

**Action Item**: Figure out what happens to each method in [`Selection`](https://w3c.github.io/selection-api/#dom-selection).

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