Log debuggerd $PID output when instrumentation gets stuck. Bug: angleproject:7242 Change-Id: I2b12e94177bce65acf68e4420fd1fcabffdb993e Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/3607499 Auto-Submit: Roman Lavrov <romanl@google.com> Reviewed-by: Yuxin Hu <yuxinhu@google.com> Commit-Queue: Yuxin Hu <yuxinhu@google.com>