(DO NOT LAND) Example GN solution for C++ 101 Exercise 0 (Hello world).

base/cpp101/hello_world.cc

Index: base/cpp101/hello_world.cc
diff --git a/base/cpp101/hello_world.cc b/base/cpp101/hello_world.cc
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+// Copyright 2017 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.
+
+#include <iostream>
+
+#include "base/logging.h"
+
+int main(int argc, char* argv[]) {
+  std::cout << "Hello, world!" << std::endl;
+
+  // Use of LOG is more common than raw std::cout.
+  LOG(INFO) << "Hello, logging!";
+}