Support sampling from the render task cache in brush images. #2619
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This PR adds support for sampling the render task cache in brush images, and test it out adds support for image sub rects in brush_image.
The sub rects implementation is duplicated between the brush and non-brush primitives, but I think it's fine to live with this temporarily because if things go well the non-brush code path will go away soon and the way I am planning to support pre-rendering tile spacing will make the two code paths diverge.
This change is