This adds new optional fields to -json-output:
{
  ...
  "error_code": see cipderr.go for possible values.
  "error_details": {
      "package": "package/path/or/prefix",
      "version": "instance version",
      "subdir": "installation subdir"
  }
}

R=iannucci@chromium.org, ddoman@chromium.org
BUG=1348065

Change-Id: I2a2bf01c180330f83fcf6813150ea1d4faef79c0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/tools/depot_tools/+/3824200Reviewed-by: Scott Lee <ddoman@chromium.org>
Commit-Queue: Vadim Shtayura <vadimsh@chromium.org>