torchx - profile scheduler validate call

Differential Revision: D66166216

Pull Request resolved: meta-pytorch#972

Author: tonykao8080

torchx/runner/api.py

@@ -433,7 +433,11 @@ def dryrun(
                         " Either a patch was built or no changes to workspace was detected."
                     )
 
-            sched._validate(app, scheduler, resolved_cfg)
+            with log_event(
+                "validate",
+                scheduler,
+            ):
+                sched._validate(app, scheduler, resolved_cfg)
             dryrun_info = sched.submit_dryrun(app, resolved_cfg)
             dryrun_info._scheduler = scheduler
             return dryrun_info