The 3.2 spec and the dEQP tests are quite clear in only requiring the 'flat' on fragment shader inputs. This restriction remains on older shader versions. Bug: angleproject:5409 Change-Id: Icc4b113b404280c2867a3e0bf6f77256a4316bff Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2574826 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org>
