Add support for one and two finger physical clicks

This CL adds support for one and two finger physical clicks.  This
is done by adding a Click() method to the touchbot class, and the
appropriate gesture_interpreter functions.

BUG=chromium:474709
TEST=manual

Change-Id: I4aed0ebfffc248a0d2f249be47b34af49d5d6876
Signed-off-by: Charlie Mooney <charliemooney@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/277062
Reviewed-by: Shyh-In Hwang <josephsih@chromium.org>
4 files changed