[mojo-bindings] Support reuse of native enum classes

mojo/converters/surfaces/surfaces_type_converters.cc

Index: mojo/converters/surfaces/surfaces_type_converters.cc
diff --git a/mojo/converters/surfaces/surfaces_type_converters.cc b/mojo/converters/surfaces/surfaces_type_converters.cc
index bff1f7016b00ee31650e74a1f6018c1f4186e882..f012bbd0699d17b40f908a29c697aaf97f54dd59 100644
--- a/mojo/converters/surfaces/surfaces_type_converters.cc
+++ b/mojo/converters/surfaces/surfaces_type_converters.cc
@@ -30,7 +30,6 @@
 
 using mus::mojom::Color;
 using mus::mojom::ColorPtr;
-using mus::mojom::CommandBufferNamespace;
 using mus::mojom::CompositorFrame;
 using mus::mojom::CompositorFramePtr;
 using mus::mojom::CompositorFrameMetadata;
@@ -540,8 +539,7 @@ SyncTokenPtr TypeConverter<SyncTokenPtr, gpu::SyncToken>::Convert(
   DCHECK(!input.HasData() || input.verified_flush());
   SyncTokenPtr sync_token(SyncToken::New());
   sync_token->verified_flush = input.verified_flush();
-  sync_token->namespace_id =
-      static_cast<CommandBufferNamespace>(input.namespace_id());
+  sync_token->namespace_id = input.namespace_id();
   sync_token->extra_data_field = input.extra_data_field();
   sync_token->command_buffer_id = input.command_buffer_id();
   sync_token->release_count = input.release_count();
@@ -551,9 +549,7 @@ SyncTokenPtr TypeConverter<SyncTokenPtr, gpu::SyncToken>::Convert(
 // static
 gpu::SyncToken TypeConverter<gpu::SyncToken, SyncTokenPtr>::Convert(
     const SyncTokenPtr& input) {
-  const gpu::CommandBufferNamespace namespace_id =
-      static_cast<gpu::CommandBufferNamespace>(input->namespace_id);
-  gpu::SyncToken sync_token(namespace_id, input->extra_data_field,
+  gpu::SyncToken sync_token(input->namespace_id, input->extra_data_field,
                             input->command_buffer_id, input->release_count);
   if (input->verified_flush)
     sync_token.SetVerifyFlush();