Vulkan: Don't break the render pass on scissor change Prior to this change, the render area was decided when the render pass was started, and remained fixed. If a small scissor was initially used, this created a render pass with a small area. If then the scissor region was expanded, the render pass was broken. This change instead expands the render area on scissor change to avoid breaking the render pass. If glInvalidateSubFramebuffer previously successfully resulted in storeOp=DONT_CARE, this optimization may need to undo that. As a result, the invalidate area is stored in the render pass and if the render area grows beyond that, invalidate is undone. Bug: angleproject:4988 Change-Id: I4e8039dec53a95a193a97cb40db3f71e397568d6 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2508983 Commit-Queue: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Tim Van Patten <timvp@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org>