Chrontel screen clearing fix for use with Aura

Aura does not support the bogus_screen_resize flag, but this flag is still
set while there are aura or non-aura builds. Likely we will not add this
hack to Aura (and the blank window hack will work) so prevent the
bogus_screen_resize from being used if aura is used.

A separate fix to the ebuild is needed to define AURA based on the USE
flag. That can safely be pushed after this CL.

BUG=chrome-os-partner:7347
TEST=gmerge, connect 5:4 aspect monitor and check unused area is black

Change-Id: Ida39d7a57c3d82419efa7c3cf33e4e7ec51bb4bb
Reviewed-on: https://gerrit.chromium.org/gerrit/16449
Tested-by: Mark Hayter <mdhayter@chromium.org>
Reviewed-by: Todd Broch <tbroch@chromium.org>
Commit-Ready: Mark Hayter <mdhayter@chromium.org>
1 file changed