mus-gpu: Allow connection request to gpu to fail.

services/ui/public/cpp/gpu/gpu_service.cc

Index: services/ui/public/cpp/gpu/gpu_service.cc
diff --git a/services/ui/public/cpp/gpu/gpu_service.cc b/services/ui/public/cpp/gpu/gpu_service.cc
index 45ce4ca04957530b31ceff9c1c62772bc6af2237..1db6009badaf2afc8f0fe5ba2962d492f1227470 100644
--- a/services/ui/public/cpp/gpu/gpu_service.cc
+++ b/services/ui/public/cpp/gpu/gpu_service.cc
@@ -113,7 +113,7 @@ void GpuService::OnEstablishedGpuChannel(
   DCHECK(gpu_service_.get());
   DCHECK(!gpu_channel_);
 
-  if (client_id) {
+  if (client_id && channel_handle.is_valid()) {
     gpu_channel_ = gpu::GpuChannelHost::Create(
         this, client_id, gpu_info, IPC::ChannelHandle(channel_handle.release()),
         &shutdown_event_, gpu_memory_buffer_manager_.get());