Adding a test to cover XCode UID collisions.

test/same-gyp-name/gyptest-library.py

Index: test/same-gyp-name/gyptest-library.py
===================================================================
--- test/same-gyp-name/gyptest-library.py	(revision 0)
+++ test/same-gyp-name/gyptest-library.py	(revision 0)
@@ -0,0 +1,20 @@
+#!/usr/bin/env python
+
+# Copyright (c) 2012 Google Inc. All rights reserved.
+# Use of this source code is governed by a BSD-style license that can be
+# found in the LICENSE file.
+
+"""
+Verifies that a dependency on two gyp files with the same name do not create a
+uid collision in the resulting generated xcode file.
+"""
+
+import TestGyp
+
+import sys
+
+test = TestGyp.TestGyp()
+
+test.run_gyp('test.gyp', chdir='library')
+
+test.pass_test()