Re: [webcomponents] Added pure functions idea to the timing alternatives. (#47)

> @@ -210,6 +210,18 @@ Introduce a variant of mutation observers where the callback is invoked after ea
>  - It could be as messy as old mutation events
>  - Might be still too expensive to use with the second approach which requires collecting every distribution candidate.
>  
> -## 4. Not a problem for v1
> +## 5. Run Distribution Callback in a Separate Scripting Context or as Pure Function
> +
> +Yet another approach is to decouple the timing from the observability by making callback execution not be observable. This can be accomplished by either creating a separate scripting context just for running distribution callbacks (similar to Houdini [ideas](https://wiki.css-houdini.org/explaining-css-layout#layout)), or some sort of not-yet-invented [pure function](http://en.wikipedia.org/wiki/Pure_function) ECMAScript primitive.
> +
> +### Pros
> +- Provides consisten distribution state to user code
> +- Interoperable
> +
> +### Cons
> +- Both separate scripting context and pure function ideas need much more thorough examination and may take years to get right
> +
> +
> +## 4. Not a Problem for v1

and this be 5?

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https://github.com/w3c/webcomponents/pull/47/files#r29535958