autotest: Define graphicsGLES suite.

This is needed to distinguish ARM from Intel testing.

BUG=none
TEST=none

Change-Id: Ie2dd286544740ed7210b6e4519d14515e15f06da
Reviewed-on: https://gerrit.chromium.org/gerrit/27183
Reviewed-by: Scott Zawalski <scottz@chromium.org>
Reviewed-by: Ilja H. Friedel <ihf@chromium.org>
Tested-by: Ilja H. Friedel <ihf@chromium.org>
Commit-Ready: Ilja H. Friedel <ihf@chromium.org>
3 files changed