Make the command cache use the directory name as part of the cache key

test/variables/commands/gyptest-commands-repeated-multidir.py

+#!/usr/bin/env python
+
+# Copyright 2014 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.
+
+"""
+Test variable expansion of '<!()' syntax commands where they are evaluated
+more than once from different directories.
+"""
+
+import TestGyp
+
+test = TestGyp.TestGyp()
+
+# This tests GYP's cache of commands, ensuring that the directory a command is
+# run from is part of its cache key. Parallelism may lead to multiple cache
+# lookups failing, resulting in the command being run multiple times by
+# chance, not by GYP's logic. Turn off parallelism to ensure that the logic is
+# being tested.
+test.run_gyp('repeated_multidir/main.gyp', '--no-parallel')
+
+test.pass_test()