human_motion_robot: Add drawing test scaling to capture script

HMR drawing test reference images require their events to be scaled in
mm and as though they were taken on a 13.3 inch screen. This change adds
that the ability for capture script to automatically perform this
scaling.

BUG=b:361660541
TEST=Copied to DUT, and manually tested

Change-Id: I00bb6c5301923874b35d6d2c1e7a0f71ad868791
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/platform/human_motion_robot/+/5876009
Tested-by: William Mahon <wmahon@google.com>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Commit-Queue: William Mahon <wmahon@google.com>