[test] Enable test status filtering by variant

tools/testrunner/local/utils.py

 # Copyright 2012 the V8 project authors. All rights reserved.
 # Redistribution and use in source and binary forms, with or without
 # modification, are permitted provided that the following conditions are
 # met:
 #
 #     * Redistributions of source code must retain the above copyright
 #       notice, this list of conditions and the following disclaimer.
 #     * Redistributions in binary form must reproduce the above
 #       copyright notice, this list of conditions and the following
 #       disclaimer in the documentation and/or other materials provided
@@ skipping 118 matching lines @@
       # In python 2.7.6 on windows, urlopen has a problem with redirects.
       # Try using curl instead. Note, this is fixed in 2.7.8.
       subprocess.check_call(["curl", source, '-k', '-L', '-o', destination])
       return
     except:
       # If there's no curl, fall back to urlopen.
       print "Curl is currently not installed. Falling back to python."
       pass
   with open(destination, 'w') as f:
     f.write(urllib2.urlopen(source).read())
+
+
+class FrozenDict(dict):
+  def __setitem__(self, *args, **kwargs):
+    raise Exception('Tried to mutate a frozen dict')
+
+  def update(self, *args, **kwargs):
+    raise Exception('Tried to mutate a frozen dict')
+
+
+def Freeze(obj):
+  if isinstance(obj, dict):
+    return FrozenDict((k, Freeze(v)) for k, v in obj.iteritems())
+  elif isinstance(obj, set):
+    return frozenset(obj)
+  elif isinstance(obj, list):
+    return tuple(Freeze(item) for item in obj)
+  else:
+    # Make sure object is hashable.
+    hash(obj)
+    return obj