Add autotest script to run piglit on target machine.
See also http://codereview.chromium.org/6746009
for corresponding ebuilds.

BUG=chromium-os:13932
TEST=./run_remote_tests.sh --board=${BOARD} --remote=x.y.z.w. graphics_Piglit
Takes about 12 minutes on my mario. Should say "Pass" and return count_subtests_pass/fail etc.

Review URL: http://codereview.chromium.org/6745001

Change-Id: If4f5474a580c993ca51fecb419806959459c61f1
11 files changed