[test] Improve printing for investigating hung tests

NOTRY=true
TBR=ulan@chromium.org

Bug: v8:6927
Change-Id: I84e239c94ed6b545544bc3db30689b8ff1b158ae
Reviewed-on: https://chromium-review.googlesource.com/718098
Commit-Queue: Michael Achenbach <machenbach@chromium.org>
Reviewed-by: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Michael Achenbach <machenbach@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48519}

tools/testrunner/local/commands.py

@@ -110,6 +110,11 @@ def RunProcess(verbose, timeout, args, additional_env, **rest):
           # TODO(machenbach): Temporary output for investigating hanging test
           # driver on mac.
           print "Attempting to kill process %d - cmd %s" % (process.pid, args)
+          try:
+            print subprocess.check_output(
+              "ps -e | egrep 'd8|cctest|unittests'", shell=True)
+          except Exception:
+            pass
           sys.stdout.flush()
         process.kill()
         if utils.GuessOS() == "macos":
@@ -117,11 +122,7 @@ def RunProcess(verbose, timeout, args, additional_env, **rest):
           # driver on mac. This will probably not print much, since kill only
           # sends the signal.
           print "Return code after signalling the kill: %s" % process.returncode
-          try:
-            print subprocess.check_output(
-              "ps -e | egrep 'd8|cctest|unittests'", shell=True)
-          except Exception:
-            pass
+          sys.stdout.flush()
 
     except OSError:
       sys.stderr.write('Error: Process %s already ended.\n' % process.pid)