mojom: Add associative arrays to the mojom language.

mojo/services/public/mojo_services_public.gyp

 # 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.
 
 {
   'includes': [
     '../../mojo_variables.gypi',
   ],
   'targets': [
     {
@@ skipping 16 matching lines @@
       ],
     },
     {
       # GN version: //mojo/services/public/interfaces/clipboard
       'target_name': 'mojo_clipboard_bindings',
       'type': 'static_library',
       'sources': [
         'interfaces/clipboard/clipboard.mojom',
       ],
       'includes': [ '../../public/tools/bindings/mojom_bindings_generator.gypi' ],
+      'variables': {
+        # TODO(erg): Expand this as we add map support to other bindings.
+        'mojom_additional_args': ['-g=c++'],
+      },
       'dependencies': [
         '../../public/mojo_public.gyp:mojo_cpp_bindings',
       ],
       'export_dependent_settings': [
         '../../public/mojo_public.gyp:mojo_cpp_bindings',
       ],
     },
     {
       # GN version: //mojo/services/public/interfaces/input_events
       'target_name': 'mojo_input_events_bindings',
@@ skipping 205 matching lines @@
       'includes': [ '../../public/tools/bindings/mojom_bindings_generator.gypi' ],
       'export_dependent_settings': [
         '../../public/mojo_public.gyp:mojo_cpp_bindings',
       ],
       'dependencies': [
         '../../public/mojo_public.gyp:mojo_cpp_bindings',
       ],
     },
   ],
 }