GLES1: glLoadIdentity / glLoadMatrix(f|x) BUG=angleproject:2306 Change-Id: I46fe961e6eb87b2f41c39afe1e943d9146a0abfa Reviewed-on: https://chromium-review.googlesource.com/1002913 Commit-Queue: Lingfeng Yang <lfy@google.com> Reviewed-by: Geoff Lang <geofflang@chromium.org>