Re: [w3ctag/design-reviews] Element Timing API for img (#326)

Oops forgot to mention, we recently decided a modification for reporting the timing. I modified the explainer Google Doc but here is a summary of the change:
* For images that pass the timing allow check (same origin or with Timin-Allow-Origin headers), report the load time, display time (after image has loaded), and calculate the intersectionRect when the image is displayed.
* For images that do not pass the timing allow check, report only the load time (not the display time). In this case, we compute the intersectionRect when image has loaded so that we can deliver the entry at this time. Otherwise we'd have to wait until display time to compute the rect and deliver the entry and we'd leak some of this display timing information unintentionally.

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