GitLab

- Palm Detection when the touchscreen reports the max radius
- Palm Detection when the touchscreeen reports a palm itself

Both are experimental features and documented as such, and or on by
default already, etc.

Bug: 1060051
Change-Id: I130c466a03b9a295c1b2777589ffc8a3ea8a5be5
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094908
Commit-Queue: Rob Schonberger <robsc@chromium.org>
Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Cr-Commit-Position: refs/heads/master@{#749044}