ninja: Write gypcmd files into the output directory instead of the tree.

test/variables/filelist/src/filelist2.gyp

+# Copyright (c) 2013 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.
+
+# This is a test to make sure that <|(foo.txt a b c) generates
+# a pre-calculated file list at gyp time and returns foo.txt.
+# This feature is useful to work around limits in the number of arguments that
+# can be passed to rule/action.
+
+{
+  'variables': {
+    'names': [
+      'John',
+      'Jacob',
+      'Jingleheimer',
+      'Schmidt',
+    ],
+  },
+  'targets': [
+    {
+      'target_name': 'foo',
+      'type': 'none',
+      'variables': {
+        'names_listfile': '<|(names.txt <@(names))',
+      },
+      'actions': [
+        {
+          'action_name': 'test_action',
+          'msvs_cygwin_shell': 0,
+          'inputs' : [ '<(names_listfile)' ],
+          'outputs': [ 'dummy_foo' ],
+          'action': [
+            'python', 'dummy.py', '<@(_outputs)', '<(names_listfile)',
+          ],
+        },
+      ],
+    },
+  ],
+}
+