I guess I should have been more clear. Why not add the primitives to SJCL and leverage an existing code base--a code base authored by someone who is considered to set a very high standard in crypto--instead of reinventing everything? Setting a higher standard than Prof. Boneh seems like a tough thing to do. Why not stand on Boneh et. al's shoulders?

It would be useful to have someone from Google elaborate on the summary they posted today. But I do recall that at least one of Prof. Boneh's postdocs mentioned in the original 2009 SJCL whitepaper is now at Google working on encryption...

[edit: Looks like that elaboration did happen elsewhere in the discussion -- just noticed it now.]