Great feature and a pretty straightforward polyfill, could even be implemented before Chrome releases it (the context menu to get the link being the hard part,

Great feature and a pretty straightforward polyfill, could even be implemented before Chrome releases it (the context menu to get the link being the hard part, but a select text + tooltip with "Copy link to this text" would work, or I'm pretty sure good designers will find great UIs for it, might even normalizes as a new pattern)