Fix some bugs in the new ScaleGestureDetector logic.
Fix some bugs in the new ScaleGestureDetector logic.

Lifting an active pointer now properly ends/begins a new gesture.

Fix out of bounds errors.

Change-Id: I29cb802785b886f65e7fc16fa7d2870f9219a3c6

xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base,xorware/android_frameworks_base