GYP: Make GYP build deterministic

test/determinism/needed-variables.gyp

-# Copyright (c) 2011 Google Inc. All rights reserved.
+# Copyright (c) 2015 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.
 
 {
   'targets': [
     {
       'target_name': 'test',
       'type': 'executable',
-      'sources': [ 'somefile.ext', ],
+      'sources': ['rule.ext'],
       'rules': [{
         'rule_name': 'rule',
         'extension': 'ext',
         'inputs': [ 'rule.py', ],
-        'outputs': [ '<(RULE_INPUT_ROOT).cc', ],
-        'action': [ 'python', 'rule.py', '<(RULE_INPUT_ROOT)', ],
+        'action': [
+          'python',
+          'rule.py',
+          '<(RULE_INPUT_ROOT)',
+          '<(RULE_INPUT_EXT)',
+          '<(RULE_INPUT_DIRNAME)',
+          '<(RULE_INPUT_NAME)',
+          '<(RULE_INPUT_PATH)',
+        ],
+        'outputs': [ 'hello_world.txt' ],
+        'sources': ['rule.ext'],
         'message': 'Processing <(RULE_INPUT_PATH)',
         'process_outputs_as_sources': 1,
         # Allows the test to run without hermetic cygwin on windows.
         'msvs_cygwin_shell': 0,
       }],
     },
   ],
 }