Verify GpuService During FrameSink Creation

services/ui/gpu/gpu_main.cc

Index: services/ui/gpu/gpu_main.cc
diff --git a/services/ui/gpu/gpu_main.cc b/services/ui/gpu/gpu_main.cc
index ba01980a44b8422f1442cc569e038f7f217011cb..580e5b4fc7eb4c38fcd0ca07ed7adc256f041d58 100644
--- a/services/ui/gpu/gpu_main.cc
+++ b/services/ui/gpu/gpu_main.cc
@@ -166,6 +166,7 @@ void GpuMain::CreateFrameSinkManagerInternal(
     cc::mojom::FrameSinkManagerRequest request,
     cc::mojom::FrameSinkManagerClientPtrInfo client_info) {
   DCHECK(!gpu_command_service_);
+  DCHECK(gpu_service_);
   gpu_command_service_ = new gpu::GpuInProcessThreadService(
       gpu_thread_task_runner_, gpu_service_->sync_point_manager(),
       gpu_service_->mailbox_manager(), gpu_service_->share_group());