Add some code to ensure that stdout is always flushed and closed to help debug layout tests hanging…

scripts/slave/chromium/layout_test_wrapper.py

Index: scripts/slave/chromium/layout_test_wrapper.py
diff --git a/scripts/slave/chromium/layout_test_wrapper.py b/scripts/slave/chromium/layout_test_wrapper.py
index 886525439acbbe90b23ec2351cc4872322e6aa6f..2cb9782af54d327e2c3eb722f73d2fc590fb27a6 100755
--- a/scripts/slave/chromium/layout_test_wrapper.py
+++ b/scripts/slave/chromium/layout_test_wrapper.py
@@ -150,6 +150,13 @@ def layout_test(options, args):
     return slave_utils.RunPythonCommandInBuildDir(build_dir, options.target,
                                                   command)
   finally:
+    if 'win_chromium_rel_ng' in sys.argv:
+      print 'layout_test_wrapper calling stdout.flush()'
+      try:
+        sys.stdout.flush()
+      finally:
+        print 'layout_test_wrapper calling stdout.close()'
+        sys.stdout.close()
     if options.enable_pageheap:
       slave_utils.SetPageHeap(build_dir, dumprendertree_exe, False)