Fix bug 4533120 - rough handling of invalid event streams in ScaleGestureDetector
Fix bug 4533120 - rough handling of invalid event streams in
ScaleGestureDetector

Make ScaleGestureDetector a bit more tolerant of bogus event streams.

Change-Id: I28a8b1ea494b7f1ca9d4c4623b95aee38f213369

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