Stream support for R16*_UNORM and P010/P016. Bug: angleproject:2850 Change-Id: Ib23b3012b5244c8e3edbdfa05d9b4e4869bbfed8 Reviewed-on: https://chromium-review.googlesource.com/1244080 Commit-Queue: Geoff Lang <geofflang@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>