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diff --git a/Tools/Scripts/webkitpy/common/array_stream.py b/Tools/Scripts/webkitpy/common/array_stream.py
new file mode 100644
index 0000000..e425d02
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+++ b/Tools/Scripts/webkitpy/common/array_stream.py
@@ -0,0 +1,66 @@
+#!/usr/bin/python
+# Copyright (C) 2010 Google Inc. 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 with the
+# distribution.
+#     * Neither the name of Google Inc. nor the names of its
+# contributors may be used to endorse or promote products derived from
+# this software without specific prior written permission.
+#
+# THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+# "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+# LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+# A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+# OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+# SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+# LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+# DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+# THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+# (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+# OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+
+"""Package that private an array-based implementation of a stream."""
+
+
+class ArrayStream(object):
+    """Simple class that implmements a stream interface on top of an array.
+
+    This is used primarily by unit test classes to mock output streams. It
+    performs a similar function to StringIO, but (a) it is write-only, and
+    (b) it can be used to retrieve each individual write(); StringIO 
+    concatenates all of the writes together.
+    """
+
+    def __init__(self):
+        self._contents = []
+
+    def write(self, msg):
+        """Implement stream.write() by appending to the stream's contents."""
+        self._contents.append(msg)
+
+    def get(self):
+        """Return the contents of a stream (as an array)."""
+        return self._contents
+
+    def reset(self):
+        """Empty the stream."""
+        self._contents = []
+
+    def empty(self):
+        """Return whether the stream is empty."""
+        return (len(self._contents) == 0)
+
+    def flush(self):
+        """Flush the stream (a no-op implemented for compatibility)."""
+        pass
+
+    def __repr__(self):
+        return '<ArrayStream: ' + str(self._contents) + '>'