These corner case formats can come about from using floating point textures and trying to copy between them. There currently isn't a good alternative in WebGL 1 for copies. BUG=angle:850 Change-Id: I3dc29e42b5ec7dcf071185bc09c6b3e9e3cb3207 Reviewed-on: https://chromium-review.googlesource.com/241048Tested-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>
