Tweaks to ViewManager:

mojo/mojo_services.gypi

 {
   'targets': [
     {
       'target_name': 'mojo_echo_bindings',
       'type': 'static_library',
       'sources': [
         'services/dbus_echo/echo.mojom',
       ],
       'variables': {
         'mojom_base_output_dir': 'mojo',
@@ skipping 221 matching lines @@
           'sources': [
             'services/view_manager/ids.h',
             'services/view_manager/main.cc',
             'services/view_manager/node.cc',
             'services/view_manager/node.h',
             'services/view_manager/node_delegate.h',
             'services/view_manager/root_node_manager.cc',
             'services/view_manager/root_node_manager.h',
             'services/view_manager/root_view_manager.cc',
             'services/view_manager/root_view_manager.h',
+            'services/view_manager/type_converters.cc',
+            'services/view_manager/type_converters.h',
             'services/view_manager/view.cc',
             'services/view_manager/view.h',
             'services/view_manager/view_manager_connection.cc',
             'services/view_manager/view_manager_connection.h',
             'services/view_manager/view_manager_export.h',
           ],
           'defines': [
             'MOJO_VIEW_MANAGER_IMPLEMENTATION',
           ],
         },
@@ skipping 59 matching lines @@
             'mojo_system_impl',
           ],
           'sources': [
             'services/dbus_echo/dbus_echo_service.cc',
           ],
         },
       ],
     }],
   ],
 }