Add infrastructure to run tests on android.

mojo/tools/mopy/memoize.py

Index: mojo/tools/mopy/memoize.py
diff --git a/mojo/tools/mopy/memoize.py b/mojo/tools/mopy/memoize.py
new file mode 100644
index 0000000000000000000000000000000000000000..249440b35adcb149b3b685e11a3e097ced6f8cdb
--- /dev/null
+++ b/mojo/tools/mopy/memoize.py
@@ -0,0 +1,18 @@
+# Copyright 2014 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.
+
+import sys
+
+# pylint: disable=C0301
+# Based on/taken from
+#   http://code.activestate.com/recipes/578231-probably-the-fastest-memoization-decorator-in-the-/
+# (with cosmetic changes).
+# pylint: enable=C0301
+def memoize(f):
+  """Memoization decorator for a function taking a single argument."""
+  class Memoize(dict):
+    def __missing__(self, key):
+      rv = self[key] = f(key)
+      return rv
+  return Memoize().__getitem__