Refer back to Jinja templates from the C++ code generated from IDL files.

third_party/WebKit/Source/bindings/tests/results/modules/BooleanOrString.h

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file has been auto-generated by code_generator_v8.py.
 // DO NOT MODIFY!
 
+// This file has been generated from the Jinja2 template in
+// third_party/WebKit/Source/bindings/templates/union_container.h.tmpl
+
 // clang-format off
 #ifndef BooleanOrString_h
 #define BooleanOrString_h
 
 #include "bindings/core/v8/Dictionary.h"
 #include "bindings/core/v8/ExceptionState.h"
 #include "bindings/core/v8/V8Binding.h"
 #include "modules/ModulesExport.h"
 #include "platform/heap/Handle.h"
 
@@ skipping 53 matching lines @@
 
 }  // namespace blink
 
 // We need to set canInitializeWithMemset=true because HeapVector supports
 // items that can initialize with memset or have a vtable. It is safe to
 // set canInitializeWithMemset=true for a union type object in practice.
 // See https://codereview.chromium.org/1118993002/#msg5 for more details.
 WTF_ALLOW_MOVE_AND_INIT_WITH_MEM_FUNCTIONS(blink::BooleanOrString);
 
 #endif  // BooleanOrString_h