--enable-hardware-gpu is supposed to enable the use of actual gpu instead of osmesa. The flag is currently not recognized by the chromium port of run-webkit-tests.
Created attachment 113216 [details] proposed patch
Comment on attachment 113216 [details] proposed patch Fun
Comment on attachment 113216 [details] proposed patch Clearing flags on attachment: 113216 Committed r99006: <http://trac.webkit.org/changeset/99006>
All reviewed patches have been landed. Closing bug.