This test makes sure the list of clear values given to the render pass
(for deferred clears) are correctly passed.

Bug: angleproject:4862
Change-Id: I4830a72a6f2b01570f6d4427ffb025429b5aa03c
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2309109
Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org>
Reviewed-by: Jonah Ryan-Davis <jonahr@google.com>