Update from https://crrev.com/320343

base/android/jni_generator/jni_generator.gyp

 # Copyright (c) 2012 The Chromium Authors. 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': 'jni_generator_py_tests',
       'type': 'none',
+      'variables': {
+        'stamp': '<(INTERMEDIATE_DIR)/jni_generator_py_tests.stamp',
+      },
       'actions': [
         {
           'action_name': 'run_jni_generator_py_tests',
           'inputs': [
             'jni_generator.py',
             'jni_generator_tests.py',
             'java/src/org/chromium/example/jni_generator/SampleForTests.java',
             'golden_sample_for_tests_jni.h',
           ],
           'outputs': [
-            '',
+            '<(stamp)',
           ],
           'action': [
             'python', 'jni_generator_tests.py',
+            '--stamp=<(stamp)',
           ],
         },
       ],
     },
     {
       'target_name': 'jni_sample_header',
       'type': 'none',
       'sources': [
         'java/src/org/chromium/example/jni_generator/SampleForTests.java',
       ],
@@ skipping 21 matching lines @@
         'jni_generator_py_tests',
         'jni_sample_header',
         'jni_sample_java',
       ],
       'sources': [
         'sample_for_tests.cc',
       ],
     },
   ],
 }