Only send the FrameSinkId to client when it is necessary

content/renderer/mus/renderer_window_tree_client.cc

Index: content/renderer/mus/renderer_window_tree_client.cc
diff --git a/content/renderer/mus/renderer_window_tree_client.cc b/content/renderer/mus/renderer_window_tree_client.cc
index d78e3f2b22218aaa8551e9db48c8ebfbdb84306f..064c463abbb609b621c76b46ae481d16a56da02b 100644
--- a/content/renderer/mus/renderer_window_tree_client.cc
+++ b/content/renderer/mus/renderer_window_tree_client.cc
@@ -77,9 +77,12 @@ void RendererWindowTreeClient::RequestCompositorFrameSinkInternal(
     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
     const CompositorFrameSinkCallback& callback) {
   std::unique_ptr<ui::ClientCompositorFrameSinkBinding> frame_sink_binding;
+  bool enable_surface_synchronization =
+      base::CommandLine::ForCurrentProcess()->HasSwitch(
+          cc::switches::kEnableSurfaceSynchronization);
   auto frame_sink = ui::ClientCompositorFrameSink::Create(
-      frame_sink_id_, std::move(context_provider), gpu_memory_buffer_manager,
-      &frame_sink_binding);
+      std::move(context_provider), gpu_memory_buffer_manager,
+      &frame_sink_binding, enable_surface_synchronization);
   tree_->AttachCompositorFrameSink(
       root_window_id_, frame_sink_binding->TakeFrameSinkRequest(),
       mojo::MakeProxy(frame_sink_binding->TakeFrameSinkClient()));