I have turned this feature on accidentally several times while using a stylus. One time, after switching between touchview and laptop modes, the sound played while no fingers were on the screen.
We have no great repro of the problem yet, other than having your hand rest in a way that looks like two fingers (while using the stylus).
Spoke with Dominic and we agreed to turn it off in M56 and investigate further in M57.
Comment 1 by kathrelk...@chromium.org
, Dec 1 2016