Introduce ScopedCommandLine

base/test/scoped_command_line.h

Index: base/test/scoped_command_line.h
diff --git a/base/test/scoped_command_line.h b/base/test/scoped_command_line.h
new file mode 100644
index 0000000000000000000000000000000000000000..dea0c6ac1e660d1ba2553c8a991433b74eb57a64
--- /dev/null
+++ b/base/test/scoped_command_line.h
@@ -0,0 +1,34 @@
+// Copyright 2016 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.
+
+#ifndef BASE_TEST_SCOPED_COMMAND_LINE_H_
+#define BASE_TEST_SCOPED_COMMAND_LINE_H_
+
+#include "base/command_line.h"
+
+namespace base {
+namespace test {
+
+// Helper class to restore the original command line at the end of the scope.
+// NOTE: In most unit tests, the command line is automatically restored per
+//       test, so this class is not necessary if the command line applies to
+//       the entire single test.
+class ScopedCommandLine final {
+ public:
+  ScopedCommandLine();
+  ~ScopedCommandLine();
+
+  // Gets the command line for the current process.
+  // NOTE: Do not name this GetCommandLine as this will conflict with Windows's
+  //       GetCommandLine and get renamed to GetCommandLineW.
+  CommandLine* GetProcessCommandLine();
+
+ private:
+  const CommandLine original_command_line_;
+};
+
+}  // namespace test
+}  // namespace base
+
+#endif  // BASE_TEST_SCOPED_COMMAND_LINE_H_