Restore GV.NOISE_AMPLITUDES

Previously the list GV.NOISE_AMPLITUDES was accidentally removed.  This
is a required constant, so we need to add it back in.

BUG=chromium:620090
TEST=manually tested

Change-Id: I6496574c65889843719da72d3bc461f73c00790a
Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/357810
1 file changed