[css-inline] Wrapping around initial letters

At the Sydney F2F we resolved [1] to add full kerning around initial
letters. I've written up a rough outline of a proposal at [2]. The basic
idea is for an initial-letter-wrap property with values (none | auto |
first-line). None is the default, and current behavior. Auto allows the
line boxes adjacent to the initial letter to just touch the ink of the
initial letter (plus some offset). First-line just makes the adjustment on
the first line, and leaves the default behavior on the other lines.
Illustrations at [2] should help make this clearer.

Instead of a new property, should we just use shape-outside, possibly with
some new values?

Thanks,

Dave

[1] https://lists.w3.org/Archives/Public/www-style/2015Mar/0315.html
[2] http://dauwhe.github.io/css-inline/Overview.html