Split surface id and simplify connecting to surfaces service

services/native_viewport/viewport_surface.cc

Index: services/native_viewport/viewport_surface.cc
diff --git a/services/native_viewport/viewport_surface.cc b/services/native_viewport/viewport_surface.cc
index 5d6bec77c0d3f03ac7b7391a8fd7a2df001cbab6..56149e0c37f9935ac3ce6b365c197c2d4d236065 100644
--- a/services/native_viewport/viewport_surface.cc
+++ b/services/native_viewport/viewport_surface.cc
@@ -111,6 +111,9 @@ void ViewportSurface::SubmitFrame() {
   surface_->SubmitFrame(SurfaceId::From(id_), frame.Pass(), mojo::Closure());
 }
 
+void ViewportSurface::SetIdNamespace(uint32_t id_namespace) {
+}
+
 void ViewportSurface::ReturnResources(
     mojo::Array<mojo::ReturnedResourcePtr> resources) {
   // We never submit resources so we should never get any back.