Add GN targets for mojom generator

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': {
         # TODO(sky): uncomment this once gyp bug fixed and remove explicit
         # setting everywhere
         # 'mojom_base_output_dir':
         #      '<!(python <(DEPTH)/build/inverse_depth.py <(DEPTH))',
         'mojom_bindings_generator':
             '<(DEPTH)/mojo/public/tools/bindings/mojom_bindings_generator.py',
       },
       'inputs': [
         '<(mojom_bindings_generator)',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/enum_declaration.tmpl',
+        '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/enum_traits.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/interface_declaration.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/interface_definition.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/interface_macros.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/interface_proxy_declaration.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/interface_stub_declaration.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/module.cc.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/module.h.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/module-internal.h.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/params_definition.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/struct_builder_definition.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/struct_declaration.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/struct_definition.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/struct_destructor.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/struct_macros.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/cpp_templates/wrapper_class_declaration.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/js_templates/enum_definition.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/js_templates/interface_definition.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/js_templates/module.js.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/js_templates/struct_definition.tmpl',
         '<(DEPTH)/mojo/public/tools/bindings/generators/mojom_cpp_generator.py',
         '<(DEPTH)/mojo/public/tools/bindings/generators/mojom_js_generator.py',
+        '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/__init__.py',
+        '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/error.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/generate/__init__.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/generate/data.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/generate/generator.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/generate/module.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/generate/pack.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/generate/template_expander.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/parse/__init__.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/parse/ast.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/parse/lexer.py',
         '<(DEPTH)/mojo/public/tools/bindings/pylib/mojom/parse/parser.py',
@@ skipping 21 matching lines @@
     '<(SHARED_INTERMEDIATE_DIR)',
   ],
   'direct_dependent_settings': {
     'include_dirs': [
       '<(DEPTH)',
       '<(SHARED_INTERMEDIATE_DIR)',
     ],
   },
   'hard_dependency': 1,
 }