enforce 4-byte alignment and length for buffers

Bug:792859
Change-Id: Ib4cde1015429153709956d4ffc2d4321decb79b0
Reviewed-on: https://skia-review.googlesource.com/82160
Reviewed-by: Mike Klein <mtklein@chromium.org>
Commit-Queue: Mike Reed <reed@google.com>
2 files changed