Michel Dänzer authored Jun 02, 2015 and Michel Dänzer committed Jun 08, 2015

Must be enabled with

	Option	"DRI3"

in xorg.conf.

(Cherry picked from radeon commits 64e1e4dbdd3caee6f5d8f6b6c094b4533fa94953,
694e04720b886060fe3eefdce59741f218c8269f,
f940fd741b15f03393037c5bb904cd74f012de9d,
fcd37f65f485291084c174666bd605e215bf1398,
4b0997e56dec0053cb2cb793e0f4ae35055ff7e6,
f68d9b5ba0c91a725b5eec9386c61bea8824c299 and
98fb4199e63fedd4607cddee64bf602d6398df81)

Reviewed-by: Alex Deucher <alexander.deucher@amd.com>