Re: [w3c/gamepad] Should fire events instead of using passive model (#4)

@pyalot maybe I'm not explaining my proposal properly.

My proposal:

> * If an axis or button changes value, an `axischange`/`buttonvaluechange` event will fire **in the render steps of the event loop (so they're limited to once per frame)**.

Whereas your comment suggests I'm proposing firing these events outside of the render steps, and perhaps even firing one event per axis – that isn't what I'm proposing.

Take `mousemove` in Firefox & Chrome as an example. If the OS receives 20 mouse position updates in a single frame, the browser will not dispatch 20 `mousemove` events. Instead, it dispatches a single `mousemove` event during the render steps, reflecting the final mouse position. If you want access to all 20 event objects, you can use `event.getCoalescedEvents()` to get them.

You only need the full 20 event objects in very particular cases, such as a painting application, where you want the full data for all mouse points despite any in-page jank.

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