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add a feature to disable using TOOL_TYPE_PALM as indicator for
palm-ness. Enable this feature by default, to maintain current
behavior across all devices in chromeos (!!)

Add a comprehensive unit test to test for behavior when this feature
is disabled.

Bug: 1009290
Change-Id: Iea348a37957ba2177c82a31d40029f0b831a578c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2094478Reviewed-by: Sean O'Brien <seobrien@chromium.org>
Reviewed-by: Michael Spang <spang@chromium.org>
Commit-Queue: Rob Schonberger <robsc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#748490}