Add motion sense tap gesture + touch counts

AWARE_TAP_PAUSE_GESTURE_COUNT is the number of times the user
has used the Motion Sense tap gesture to pause media.  This number
is used to determine whether to show the "Tap to pause media"
contextual tooltip.

AWARE_TAP_PAUSE_TOUCH_COUNT is the number of times the user has
touched the device to pause media instead of using the Motion Sense
tap gesture (Motion Sense and tap gesture must be active for this value
to increment). This number is also used to determine whether to show the
"Tap to pause media" contextual tip.

We back up these counts so that users moving to new devices with Motion
Sense will not be given these contextual tips again if they already know
how to use the feature.

Test: manual
Bug: 138296598
Change-Id: I702719fb7cec8b6be9dff91d212a00fb26129957