Workaround for crash from invalid snapshot

- wrapHardwareBuffer will throw an illegal argument exception when
  the buffer doesn't have this flag, but it's not clear how this
  happens yet because all the buffers should be from surface flinger
  snapshots...

Bug: 157562905
Test: Manual
Change-Id: I48be367d8aafb3e17f11a73a73432617a247c0dd