Include a better sample JSON dataset in traceline.

tools/traceline/traceline/scripts/filter_short.py

Index: tools/traceline/traceline/scripts/filter_short.py
diff --git a/tools/traceline/traceline/scripts/filter_short.py b/tools/traceline/traceline/scripts/filter_short.py
new file mode 100755
index 0000000000000000000000000000000000000000..9d8466ed1f1a4f92a75369ad23cf057374aebe3f
--- /dev/null
+++ b/tools/traceline/traceline/scripts/filter_short.py
@@ -0,0 +1,23 @@
+# Copyright (c) 2009 The Chromium Authors. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+# This script takes an input JSON, and filters out all system call events that
+# took less than 0.2ms.  This helps trim down the JSON data to only the most
+# interesting / time critical events.
+
+import sys
+import re
+
+def parseEvents(z):
+  print 'parseEvents(['
+  for e in z:
+    if e.has_key('ms') and e.has_key('done'):
+      dur = e['done'] - e['ms']
+      if dur < 0.2:
+        continue
+    # Ugly regex to remove the L suffix on large python numbers.
+    print '%s,' % re.sub('([0-9])L\\b', '\\1', str(e))
+  print '])'
+
+execfile(sys.argv[1])