Vulkan: Fix glBlitFramebuffer() for pre-rotation This involves cases of blitting to/from a rotated default framebuffer, potentially with scaling in one or both dimensions. Various adjustments are needed at different times in the stack, including in the custom BlitResolve fragment shaders. Various tests are affected, including the following: Test: angle_end2end_tests --gtest_filter=*EGLPreRotationLargeSurfaceTest.OrientedWindowWithBlitFramebuffer Test: angle_deqp_gles3_tests --gtest_filter=dEQP.GLES3/functional_fbo_invalidate_\* Bug: b/158337857 Change-Id: Ibb176e4215784e85c0f34e6e1c22ba662517fed2 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2242359 Reviewed-by: Ian Elliott <ianelliott@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Commit-Queue: Ian Elliott <ianelliott@google.com>