GLES1: state: Add crop rect / generate mipmap texparameters GLES1 has at least two places where all texture objects can carry more state: - Crop rectangle, used with glDrawTex - Generate mipmap parameter, which lets the user auto-generate mipmaps for textures from a texture parameter This CL adds them to the Texture / TextureState classes. BUG=angleproject:2306 Change-Id: Ia43882d36f166b49a09434e77f8c288478e2a454 Reviewed-on: https://chromium-review.googlesource.com/909579 Reviewed-by: Lingfeng Yang <lfy@google.com> Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Lingfeng Yang <lfy@google.com>