add GL_ANGLE_robust_resource_initialization extension to xml Bug: angleproject:7165 Change-Id: I17a566714bc3e1a0e19dee4bdea10c7360050172 Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3567539 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Geoff Lang <geofflang@chromium.org> Commit-Queue: Geoff Lang <geofflang@chromium.org>