Add command line option to set number of DRM buffers

Introduces the "-n" or "--num-buffers" command line option.

BUG=chromium-os:25587
TEST=run glmark2-es2-drm with "-n <num>" option

Change-Id: If62734b62016ab2f5c72eba1ed66d4d4e56675d5
Signed-off-by: Simon Que <sque@chromium.org>
3 files changed