scripts: sysmon: add cpu times metrics for processes

BUG=b:255782067
TEST=Ran the unit tests.

Change-Id: I3fc5288f50ca11a358837be72fe9d78e9fa2a588
Reviewed-on: https://chromium-review.googlesource.com/c/chromiumos/chromite/+/4242821
Tested-by: Congbin Guo <guocb@chromium.org>
Reviewed-by: Sergey Fetisov <sfetisov@google.com>
Auto-Submit: Congbin Guo <guocb@chromium.org>
Commit-Queue: Congbin Guo <guocb@chromium.org>
diff --git a/scripts/sysmon/proc_metrics_unittest.py b/scripts/sysmon/proc_metrics_unittest.py
index 5c9bde1..ed1fbf6 100644
--- a/scripts/sysmon/proc_metrics_unittest.py
+++ b/scripts/sysmon/proc_metrics_unittest.py
@@ -22,6 +22,12 @@
     proc.cmdline.return_value = cmdline
     proc.num_threads.return_value = num_threads
     proc.cpu_percent.return_value = 2
+
+    proc.cpu_times.return_value.system = 10
+    proc.cpu_times.return_value.user = 11
+    proc.cpu_times.return_value.iowait = 12
+    proc.cpu_times.return_value.children_system = 13
+    proc.cpu_times.return_value.children_user = 14
     if parent is not None:
         proc.parent.return_value = parent
     return proc