diff --git a/base/BUILD.gn b/base/BUILD.gn
index 0573c2db7639..5601a403c482 100644
--- a/base/BUILD.gn
+++ b/base/BUILD.gn
@@ -624,6 +624,8 @@ component("base") {
     "strings/cstring_view.h",
     "strings/durable_string_view.h",
     "strings/escape.cc",
     "strings/escape.h",
+    "strings/fake_simple_class.cc",
+    "strings/fake_simple_class.h",
     "strings/lazy_string_builder.cc",
     "strings/lazy_string_builder.h",
     "strings/levenshtein_distance.cc",
diff --git a/base/strings/fake_simple_class.cc b/base/strings/fake_simple_class.cc
new file mode 100644
index 0000000000000..d811801c431d1
--- /dev/null
+++ b/base/strings/fake_simple_class.cc
@@ -0,0 +1,18 @@
+// Copyright 2025 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#include "base/strings/fake_simple_class.h"
+
+#include "base/logging.h"
+
+namespace base {
+
+FakeSimpleClass::FakeSimpleClass() = default;
+FakeSimpleClass::~FakeSimpleClass() = default;
+
+void FakeSimpleClass::ProcessStruct(const NestedStruct& s) {
+  if (s.field1) {
+    LOG(INFO) << "Field2: " << s.field2;
+  }
+}
+
+// static
+FakeSimpleClass::NestedStruct FakeSimpleClass::CreateNestedStruct(
+    bool field1,
+    const std::string& field2) {
+  NestedStruct s;
+  s.field1 = field1;
+  s.field2 = field2;
+  return s;
+}
+
+}  // namespace base
diff --git a/base/strings/fake_simple_class.h b/base/strings/fake_simple_class.h
new file mode 100644
index 0000000000000..8b3a3c1a2d1f4
--- /dev/null
+++ b/base/strings/fake_simple_class.h
@@ -0,0 +1,22 @@
+// Copyright 2025 The Chromium Authors
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef BASE_STRINGS_FAKE_SIMPLE_CLASS_H_
+#define BASE_STRINGS_FAKE_SIMPLE_CLASS_H_
+
+#include <string>
+
+namespace base {
+
+class FakeSimpleClass {
+ public:
+  struct NestedStruct {
+    bool field1 = false;
+    std::string field2;
+  };
+
+  FakeSimpleClass();
+  ~FakeSimpleClass();
+
+  void ProcessStruct(const NestedStruct& s);
+  static NestedStruct CreateNestedStruct(bool field1, const std::string& field2);
+};
+
+}  // namespace base
+
+#endif  // BASE_STRINGS_FAKE_SIMPLE_CLASS_H_