Changing the stressapptest -M parameter from 512 to 320 to accomodate bigger GPU carveout

BUG=None
TEST=On Kaen, 512 always fails.  360 sometimes blows up. 320 has some margin.

Change-Id: I30f4ca9d48a89f04bc00700998b083e5a47b9098
Reviewed-on: http://gerrit.chromium.org/gerrit/10071
Commit-Ready: Micah Catlin <micahc@chromium.org>
Reviewed-by: Micah Catlin <micahc@chromium.org>
Tested-by: Micah Catlin <micahc@chromium.org>
1 file changed