Batch ACTION_MOVE events to vsync boundries when resizing task

- Created helper class BatchedInputEventReceiver for batching
ACTION_MOVE events to vsync boundries.
- Switched TaskPositioner to use new helper class for input events
so we reduce the number of input events we process per vsync.

Bug: 24375616
Change-Id: I4ee27949b956784fb89d8f190497e4765522c9d3
2 files changed