Have jni_generator.gypi specify include_dirs to dependent targets.

build/jni_generator.gypi

 # 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.
 
 # This file is meant to be included into a target to provide a rule
 # to generate jni bindings for Java-files in a consistent manner.
 #
 # To use this, create a gyp target with the following form:
 #  {
 #    'target_name': 'base_jni_headers',
@@ skipping 49 matching lines @@
       'process_outputs_as_sources': 1,
       'conditions': [
         ['jni_generator_jarjar_file != ""', {
           'inputs': [
             '<(jni_generator_jarjar_file)',
           ],
         }]
       ],
     },
   ],
+  'direct_dependent_settings': {
+    'include_dirs': [
+      '<(SHARED_INTERMEDIATE_DIR)/<(jni_gen_package)',
+    ],
+  },
   # This target exports a hard dependency because it generates header
   # files.
   'hard_dependency': 1,
 }