Improve validation in RS FieldPacker.
Improve validation in RS FieldPacker.

Change-Id: I9f6a58048129db4978c893c2dc591b0ed825d05f

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