Replace usage of SurfaceId's client_id with FrameSinkId

ui/views/mus/surface_context_factory.cc

Index: ui/views/mus/surface_context_factory.cc
diff --git a/ui/views/mus/surface_context_factory.cc b/ui/views/mus/surface_context_factory.cc
index 5ddc564d36efaaef1bc84b9d2fbacc7926accc97..27d618b4838521ba2e5b26951bd79b30a5d085f3 100644
--- a/ui/views/mus/surface_context_factory.cc
+++ b/ui/views/mus/surface_context_factory.cc
@@ -89,8 +89,8 @@ cc::TaskGraphRunner* SurfaceContextFactory::GetTaskGraphRunner() {
   return raster_thread_helper_.task_graph_runner();
 }
 
-uint32_t SurfaceContextFactory::AllocateSurfaceClientId() {
-  return next_surface_id_namespace_++;
+cc::FrameSinkId SurfaceContextFactory::AllocateFrameSinkId() {
+  return cc::FrameSinkId(next_surface_id_namespace_++, 0);
 }
 
 cc::SurfaceManager* SurfaceContextFactory::GetSurfaceManager() {