Support multisample 2D array textures on ES 3.0 contexts Supported via OES_texture_storage_multisample_2d_array enabled together with ANGLE_texture_multisample. Drive-by: Fixed exposure conditions in the OpenGL backend to match the implementation. Fixed: angleproject:382298321 Change-Id: I21b037aac7bebc35df267e9dd468088ebce35e71 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/6075241 Reviewed-by: Shahbaz Youssefi <syoussefi@chromium.org> Reviewed-by: Amirali Abdolrashidi <abdolrashidi@google.com> Commit-Queue: Amirali Abdolrashidi <abdolrashidi@google.com>