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

gpu/ipc/gpu_command_buffer_traits.cc

Index: gpu/ipc/gpu_command_buffer_traits.cc
diff --git a/gpu/ipc/gpu_command_buffer_traits.cc b/gpu/ipc/gpu_command_buffer_traits.cc
index a1932eede1b2da38e83a031047c77c801409d6ff..faed0e25cd6d385f142d68e8bdae1e5d9fc849ed 100644
--- a/gpu/ipc/gpu_command_buffer_traits.cc
+++ b/gpu/ipc/gpu_command_buffer_traits.cc
@@ -79,7 +79,7 @@ bool ParamTraits<gpu::SyncToken>::Read(const Message* m,
     return false;
   }
 
-  p->Set(namespace_id, command_buffer_id, release_count);
+  p->Set(namespace_id, 0, command_buffer_id, release_count);
   if (p->HasData()) {
     if (!verified_flush)
       return false;