Implement DRM_FORMAT to GL format conversion Bug: chromium:1096442 Change-Id: I79722073bd1f2674b40e7eaa8d5311a09bc36416 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2309636 Commit-Queue: Jiajia Qin <jiajia.qin@intel.com> Reviewed-by: Geoff Lang <geofflang@chromium.org> Reviewed-by: Jonah Ryan-Davis <jonahr@google.com> Reviewed-by: Kenneth Russell <kbr@chromium.org>