ScaleGestureDetector does the safety dance.
ScaleGestureDetector does the safety dance.

Warn in the event of possibly bogus event streams and don't try to
clear empty history.

Bug 7241640
Bug 7243006

Change-Id: I037cf1334cab790ef5998ca5f8f6b323ed5f4459

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