First crack at adding a GYP_GENERATOR for determining various things

test/analyzer/subdir/subdir.gyp

Index: test/analyzer/subdir/subdir.gyp
diff --git a/test/analyzer/subdir/subdir.gyp b/test/analyzer/subdir/subdir.gyp
new file mode 100644
index 0000000000000000000000000000000000000000..cd0f0134e54337d3355f69e97abf7301a3b35d02
--- /dev/null
+++ b/test/analyzer/subdir/subdir.gyp
@@ -0,0 +1,19 @@
+# Copyright (c) 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.
+
+{
+  'variables': {
+    'trailing_dir_path': '../',
+   },
+  'targets': [
+    {
+      'target_name': 'foo',
+      'type': 'static_library',
+      'sources': [
+        'subdir_source.c',
+        '<(trailing_dir_path)/parent_source.c',
+      ],
+    },
+  ],
+}