Fix potential stuck when enabled pointer location

Replace ArrayList by SparseArray to track each pointer by pointer id, so
we could avoid generating lots redundant PointerStates if the event has
an unexpected pointer id value (such as 0xFFFFFFFF).

This also fix text size and path width when the density has changed.

Bug: 243548346
Test: enabled pointer location
Change-Id: I0a5b04b3034f02c3b06803a90d9b97561afdd9e0