Add a little print debugging to determine what's hanging

TBR=epoger
BUG=skia:1329

Review URL: https://codereview.chromium.org/195733008

scripts/run_cmd.py

diff --git a/scripts/run_cmd.py b/scripts/run_cmd.py
index a30d2d5..edc00e6 100755
--- a/scripts/run_cmd.py
+++ b/scripts/run_cmd.py
@@ -307,6 +307,7 @@
       procs.append((hostname, _launch_on_remote_host(hostname, cmd)))
 
   for slavename, proc in procs:
+    print 'Awaiting results from %s' % slavename
     results.update(_get_remote_host_results(slavename, proc))
 
   return results