Fix missing begin event on Android for Pinch and Rotation
#2264
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Description
This PR sets the focal point/anchor to the position of the pointer before sending
beginevent on Android. At the position it's being sent, it's alwaysNaNat the moment, which causes the event not to be received by the detector.Test plan
Add pinch & rotation gestures to the app and check whether the
beginevent is called.