Implement EGL_KHR_gl_renderbuffer_image support. BUG=14610416 Change-Id: I406d356a70c2c3b2a2b6861b7a8c00a01fe5c8cf Reviewed-on: https://swiftshader-review.googlesource.com/1061 Reviewed-by: Nicolas Capens <nicolascapens@google.com>