Added an extra sync token field for extra command buffer identification.

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 f0a32bdb37345be225b2c6c2297231a0a3cd529c..f0944548c9b4b68b8d1d5ea9c13b9c870c3bf086 100644
--- a/mojo/converters/surfaces/surfaces_type_converters.cc
+++ b/mojo/converters/surfaces/surfaces_type_converters.cc
@@ -547,8 +547,8 @@ 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->command_buffer_id,
-                            input->release_count);
+  gpu::SyncToken sync_token(namespace_id, 0,
+                            input->command_buffer_id, input->release_count);
   if (input->verified_flush)
     sync_token.SetVerifyFlush();