Primero habremos de actualizar la raspberry a debian jessie (aquí instrucciones) y luego:

wget http://launchpadlibrarian.net/185065105/chromium-browser_37.0.2062.120-0ubuntu0.12.04.1~pkg917_armhf.deb

wget http://launchpadlibrarian.net/185065117/chromium-codecs-ffmpeg-extra_37.0.2062.120-0ubuntu0.12.04.1~pkg917_armhf.deb

sudo dpkg -i chromium-codecs-ffmpeg-extra_37.0.2062.120-0ubuntu0.12.04.1~pkg917_armhf.deb chromium-browser_37.0.2062.120-0ubuntu0.12.04.1~pkg917_armhf.deb

Resumidas de aquí:
http://blog.valitov.me/2014/06/installing-google-chromium-on-arm.html?m=1