This pulls in https://chromiumcodereview.appspot.com/10079030/
and https://chromiumcodereview.appspot.com/10876082/ among others,
which are needed for more *nix platforms support.

Review URL: https://codereview.chromium.org/10983022
Patch from Paweł Hajdan Jr. <phajdan.jr@chromium.org>.

git-svn-id: http://v8.googlecode.com/svn/branches/bleeding_edge@12612 ce2b1a6d-e550-0410-aec6-3dcde31c8c00