[cairo] API to set PDF meta data (author, creator, etc)

[Adrian Johnson]

Adib Taraben wrote:
> Hello Cairo team,
> 
> attached there is a patch for the pdf surface to support custom info
> dictionary in order to set author, creator, etc.
> 

I've updated to ROADMAP to include a metadata API for 1.8.

http://gitweb.freedesktop.org/?p=cairo;a=commit;h=8a4adcf5f3c893505a53882a0532a220f79f4409

This should be a non backend specific API as there are other backends
that can also store metadata. The PDF metadata also supports UTF-16
strings so we should support that. We also don't want applications to
have to understand the PDF date format to set the date in the metadata.