Implement the renderer side of the mojo based local storage implementation.

mojo/common/common_type_converters.h

 // Copyright 2013 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 MOJO_COMMON_COMMON_TYPE_CONVERTERS_H_
 #define MOJO_COMMON_COMMON_TYPE_CONVERTERS_H_
 
 #include <stdint.h>
 
 #include "base/strings/string16.h"
@@ skipping 18 matching lines @@
 template <>
 struct MOJO_COMMON_EXPORT TypeConverter<String, base::string16> {
   static String Convert(const base::string16& input);
 };
 
 template <>
 struct MOJO_COMMON_EXPORT TypeConverter<base::string16, String> {
   static base::string16 Convert(const String& input);
 };
 
-// TODO(erg): In the very long term, we will want to remove conversion between
-// std::strings and arrays of unsigned bytes. However, there is too much code
-// across chrome which uses std::string as a bag of bytes that we probably
-// don't want to roll this function at each callsite.
 template <>
 struct MOJO_COMMON_EXPORT TypeConverter<std::string, Array<uint8_t> > {
   static std::string Convert(const Array<uint8_t>& input);
 };
 
 template <>
 struct MOJO_COMMON_EXPORT TypeConverter<Array<uint8_t>, std::string> {
   static Array<uint8_t> Convert(const std::string& input);
 };
 
+template <>
+struct MOJO_COMMON_EXPORT TypeConverter<base::string16, Array<uint8_t> > {

[dcheng, 2016/03/18 06:35:29]

Nit: >>

[jam, 2016/03/18 16:48:33]

Done.

+  static base::string16 Convert(const Array<uint8_t>& input);
+};
+
+template <>
+struct MOJO_COMMON_EXPORT TypeConverter<Array<uint8_t>, base::string16> {
+  static Array<uint8_t> Convert(const base::string16& input);
+};
+
 }  // namespace mojo
 
 #endif  // MOJO_COMMON_COMMON_TYPE_CONVERTERS_H_