Merge "Use SOURCE_CLASS_POINTER as the default source for MotionEvent" into sc-v2-dev am: 72e278d976 am: 0e229b7f33

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/16432384

Change-Id: I8a3495d162b6957263febbc291265e9bd37fa0e5