jinja2: support file references in templates.

build/android/jinja_template.gypi

 # Copyright 2014 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 process one or more
 # Jinja templates.
 #
 # To process a single template file, create a gyp target with the following
 # form:
 #  {
@@ skipping 27 matching lines @@
 
 {
   'actions': [
     {
       'action_name': '<(_target_name)_jinja_template',
       'message': 'processing jinja template',
       'variables': {
         'jinja_output%': '',
         'jinja_outputs_zip%': '',
         'jinja_inputs_base_dir%': '',
+        'jinja_includes%': [],
         'jinja_variables%': [],
         'jinja_args': [],
       },
       'inputs': [
         '<(DEPTH)/build/android/gyp/util/build_utils.py',
         '<(DEPTH)/build/android/gyp/jinja_template.py',
         '<@(jinja_inputs)',
+        '<@(jinja_includes)',
       ],
       'conditions': [
         ['jinja_output != ""', {
           'outputs': [ '<(jinja_output)' ],
           'variables': {
             'jinja_args': ['--output', '<(jinja_output)'],
           },
         }],
         ['jinja_outputs_zip != ""', {
           'outputs': [ '<(jinja_outputs_zip)' ],
           'variables': {
             'jinja_args': ['--outputs-zip', '<(jinja_outputs_zip)'],
           },
         }],
         ['jinja_inputs_base_dir != ""', {
           'variables': {
             'jinja_args': ['--inputs-base-dir', '<(jinja_inputs_base_dir)'],
           },
         }],
       ],
       'action': [
         'python', '<(DEPTH)/build/android/gyp/jinja_template.py',
         '--inputs', '<(jinja_inputs)',
         '--variables', '<(jinja_variables)',
         '<@(jinja_args)',
       ],
     },
   ],
 }