Bigger hammer: Run each command and block, without piping stdout/stderr

TBR=epoger
BUG=skia:1329

Review URL: https://codereview.chromium.org/199353003

scripts/run_cmd.py

diff --git a/scripts/run_cmd.py b/scripts/run_cmd.py
index 18182c5..247c9a6 100755
--- a/scripts/run_cmd.py
+++ b/scripts/run_cmd.py
@@ -173,6 +173,7 @@
       subprocess.Popen instance.
   """
   print ' '.join(cmd)
+  subprocess.call(cmd)
   return subprocess.Popen(cmd, shell=False, stderr=subprocess.PIPE,
                           stdout=subprocess.PIPE)