GitLab

To use, make a BPF program return ErrorCode(ERR_TRACE + ret_data), where
ret_data is a 16 bit value that will be available to the tracing process
via PTRACE_GETEVENTMSG.

BUG=231000

Review URL: https://codereview.chromium.org/278583005

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@276595 0039d316-1c4b-4281-b951-d872f2087c98