code: private static void addCodeToProvideSoyNamespace(StringBuilder header, SoyFileNode soyFile) {
      header.append("goog.provide('").append(soyFile.getNamespace()).append("');\n");
    }
docs: Helper for visitSoyFileNode(SoyFileNode) to add code to provide Soy namespaces.
  
  @param header
  @param soyFile The node we're visiting.