Create test to validate scissor size is correct The concern is that if a user changes the framebuffer's attachment to one with a different size, contextVk->updateScissor() may not be called and we may render too much/little. This change creates a test to verify that when the FBO's attachment size changes, the correct amount of fragments are drawn. Bug: angleproject:3754 Test: FramebufferTest_ES3 Change-Id: I47108d6fe3e671ddc8c30cf969f63c1c3ae76f84 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/1842128 Commit-Queue: Courtney Goeltzenleuchter <courtneygo@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Courtney Goeltzenleuchter <courtneygo@google.com>