GitLab

To prevent poor quality touches on hana, add a filter for low pressure
touches, such as those generated by a pencil.  Finger presses are above
the chosen threshold and aren't affected.  If a contact ever exceeds the
presure threshold, all remaining events for that contact are sent.

CQ-DEPEND=CL:1093584
BUG=b:69232663
TEST=manual testing on hana with pressure filter enabled

Change-Id: Ic2d56eb656e318ee46744ef37f6055d8573a2261
Reviewed-on: https://chromium-review.googlesource.com/1096126Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Sean O'Brien <seobrien@chromium.org>
Cr-Commit-Position: refs/heads/master@{#569415}