Fix memory layout of imageformats.h's 16-bit structs Change-Id: I87c363f68394d868d2a72e84bfdfd64db0c6e1d0 Reviewed-on: https://chromium-review.googlesource.com/284652 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Tested-by: Austin Kinross <aukinros@microsoft.com>