Add a perf test for drawing with alternating programs The programs have a different shader interface, to force rebinding descriptor sets in the Vulkan backend. Bug: angleproject:4261 Change-Id: I7a18a441483dfe34bd40b5a30ca34b7fd0dc3219 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1990085 Commit-Queue: Jamie Madill <jmadill@chromium.org> Reviewed-by: Jamie Madill <jmadill@chromium.org>