Count active touches in MultiTouchMotionAccumulator
Counting active touches will allow us to detect first touch on the device. This information will be used by mapper to getect start of a new gesture, when the first touch is detected. Bug: 301055381 Test: atest MultiTouchMotionAccumulatorTest Change-Id: I53f65daef3e5aa324f42eec6aa85ed6d5ef01bf5
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