Related to: https://chromium-review.googlesource.com/c/angle/angle/+/1520988 The program uniform buffers were dirtied for this edge case, but it should have been the driver uniform buffers. This CL fixes this and adds a tests case which catches this. Bug: 945903 Change-Id: I6142771e200513ed0251fc97cec68d371d39ec1a Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1565059 Commit-Queue: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Shrek Shao <shrekshao@google.com>
