Vulkan: Dynamic state for depth bias Bug: angleproject:5906 Change-Id: I8fd7e3262fddf3aec855afdd3e4c1b9801040da1 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3638983 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Yuxin Hu <yuxinhu@google.com> Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>