Decrease extension speed for Line gestures

For some reason the Allion robot was struggling to extend both finger at
the same time when using a dual-finger tip.  In the brief pause between
issuing the commands to extend each finger (has to send them one at a
time) the first finger was getting too far ahead of the second, causing
them to jam because they need to remain parallel since they're connected
by a shared fingertip.

This CL reduces the speed at which they extend.  This means the first
finger can't get so far ahead in the brief period of time before the
second finger starts moving.  This prevents the jamming from happening,
and really only slows down the gestures a negligible amount.

BUG=chromium:620090
TEST=We used this new speed for all of our testing at Allion and it
cleared up the issue just fine.

Change-Id: I190a919707fdd61e3a52043fdc04b5cb55ec699e
Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/352640
Reviewed-by: Shyh-In Hwang <josephsih@chromium.org>
1 file changed