Re: [w3ctag/design-reviews] Request Review: Gesture Delegation (#199)

My original rationale for making this separate from feature policy was that you might have a situation where:

 * the top-level page does not want to delegate any gestures it receives to its subframes
 * one of those subframes wants to delegate gestures that **it** receives to its own children

By using feature policy as the mechanism for gesture delegation, that isn't possible. Once the feature is disabled by the top-level page, there is no way for a subframe to turn that feature on for itself or its own children. 

This is, I think, the right behaviour for most features -- for things like fullscreen, geolocation, or camera, you don't want subframes to be able to re-enable them once disabled. For an attribute like this, which is more about defining the relationship between a frame and its immediate children, it makes less sense as a restriction.

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