Adds a base32 component.

components/base32/base32.h

Index: components/base32/base32.h
diff --git a/components/base32/base32.h b/components/base32/base32.h
new file mode 100644
index 0000000000000000000000000000000000000000..440c06375c8ac66826392cd8e3ff0bb013427519
--- /dev/null
+++ b/components/base32/base32.h
@@ -0,0 +1,32 @@
+// 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 COMPONENTS_BASE32_BASE32_H_
+#define COMPONENTS_BASE32_BASE32_H_
+
+#include <string>
+
+#include "base/strings/string_piece.h"
+
+namespace base32 {
+
+enum class Base32EncodePolicy {
+  // Include the trailing padding in the output, when necessary.
+  INCLUDE_PADDING,
+  // Remove the trailing padding from the output.
+  OMIT_PADDING
+};
+
+// Encodes the |input| string in base32, defined in RFC 4648:
+// https://tools.ietf.org/html/rfc4648#section-5
+//
+// The |policy| defines whether padding should be included or omitted from the
+// encoded |*output|. |input| and |*output| may not reference the same storage.

[sdefresne, 2016/06/01 14:25:38]

I think it should be "|input| and |*output| must not reference the same
storage." as by "may not" I understand that it is supported configuration.

[Rob Percival, 2016/06/01 14:37:57]

Done.

+void Base32Encode(base::StringPiece input,
+                  Base32EncodePolicy policy,
+                  std::string* output);
+
+}  // namespace base32
+
+#endif  // COMPONENTS_BASE32_BASE32_H_