Implement CSVReader and CSVWriter to be used for password import and export.

components/password_manager/core/browser/export/csv_writer.h

Index: components/password_manager/core/browser/export/csv_writer.h
diff --git a/components/password_manager/core/browser/export/csv_writer.h b/components/password_manager/core/browser/export/csv_writer.h
new file mode 100644
index 0000000000000000000000000000000000000000..28a304588ecd8ff49d0dbb0b591f5680a6b00bac
--- /dev/null
+++ b/components/password_manager/core/browser/export/csv_writer.h
@@ -0,0 +1,35 @@
+// 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.
+
+#ifndef COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_EXPORT_CSV_WRITER_H_
+#define COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_EXPORT_CSV_WRITER_H_
+
+#include <map>
+#include <string>
+#include <vector>
+
+#include "base/macros.h"
+
+namespace password_manager {
+
+// Writes tabular data into CSV (Comma Separated Values) format as defined in
+// RFC 4180, with the following caveats:
+//   * The output encoding will be UTF-8. No code points will be escaped.
+//   * Lines will be separated by the platform-specific EOL terminator.
+//   * Values will be enclosed in double-quotes if and only if they contain
+//     either of the following characters: CR, LF, double-quote ("), comma (,).
+//
+// The CSV representation of the supplied data will be generated into |csv|,
+// which is first cleared of pre-existing data. The first line of the file will
+// contain |column_names|, followed by as many lines as there are elements in
+// |records|. Each element in |records| should be a dictionary that maps column
+// names to values, so they can be output in the right order. All passed in
+// strings should be UTF-8 encoded.
+void WriteCSV(const std::vector<std::string>& column_names,
+              const std::vector<std::map<std::string, std::string>>& records,
+              std::string* csv);
+
+}  // namespace password_manager
+
+#endif  // COMPONENTS_PASSWORD_MANAGER_CORE_BROWSER_EXPORT_CSV_WRITER_H_