A single frame of the scanned heat map is too big to fit into RAM. Let's
encode it so that we can get the whole frame.
BUG=None
TEST=Touch on various places on the panel and see corresponding results.
BRANCH=None
Change-Id: I8c7c72d5d4a83ebc2018c0abd57075697c931bef
Signed-off-by: Vic Yang <victoryang@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/199940
Reviewed-by: Vincent Palatin <vpalatin@chromium.org>
