Re: [w3ctag/spec-reviews] Filters in Canvas 2D (#116)

I think this is mostly straightforward, allowing application of existing filter concepts to canvas.  I filed two minor issues (see above).

I don't think this exposes any issues about the atomicity of canvas drawing operations beyond what's already exposed by [<code>globalAlpha</code> and <code>globalCompositeOperation</code>](https://html.spec.whatwg.org/multipage/scripting.html#compositing), although it would be nice to check that somebody else agrees with my assessment there.

One other thing I need to look into a little further is that I recall that SVG filters used to define a concept of a [filter effects region](https://www.w3.org/TR/SVG11/filters.html#FilterEffectsRegion).  I need to figure out if this concept is still present in filters or if it's been removed.  (I think I recall some talk about removing it.)  If it's not removed, then this section would presumably need to define it.  (I think it's better off gone, replaced by "use the region that's needed to get the right result".)

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