Mojo: Mojom: Add flag to force using bundled Python modules.

mojo/public/tools/bindings/mojom_bindings_generator.gypi

 # Copyright 2013 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.
 
 {
   'rules': [
     {
       'rule_name': 'Generate C++ source files from mojom files',
       'extension': 'mojom',
       'variables': {
@@ skipping 42 matching lines @@
       ],
       'outputs': [
         '<(SHARED_INTERMEDIATE_DIR)/<(mojom_base_output_dir)/<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).mojom.cc',
         '<(SHARED_INTERMEDIATE_DIR)/<(mojom_base_output_dir)/<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).mojom.h',
         '<(SHARED_INTERMEDIATE_DIR)/<(mojom_base_output_dir)/<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).mojom.js',
         '<(SHARED_INTERMEDIATE_DIR)/<(mojom_base_output_dir)/<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).mojom-internal.h',
       ],
       'action': [
         'python', '<@(mojom_bindings_generator)',
         '<(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).mojom',
+        '--use_chromium_bundled_pylibs',
         '-d', '<(DEPTH)',
         '-o', '<(SHARED_INTERMEDIATE_DIR)/<(mojom_base_output_dir)/<(RULE_INPUT_DIRNAME)',
       ],
       'message': 'Generating Mojo bindings from <(RULE_INPUT_DIRNAME)/<(RULE_INPUT_ROOT).mojom',
       'process_outputs_as_sources': 1,
     }
   ],
   'include_dirs': [
     '<(DEPTH)',
     '<(SHARED_INTERMEDIATE_DIR)',
   ],
   'direct_dependent_settings': {
     'include_dirs': [
       '<(DEPTH)',
       '<(SHARED_INTERMEDIATE_DIR)',
     ],
   },
   'hard_dependency': 1,
 }