Mojo: more idiomatic C++ bindings

mojo/public/cpp/bindings/lib/string_serialization.cc

+// 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.
+
+#include "mojo/public/cpp/bindings/lib/string_serialization.h"
+
+#include <string.h>
+
+namespace mojo {
+
+size_t GetSerializedSize_(const String& input) {
+  if (!input)
+    return 0;
+  return internal::Align(sizeof(internal::String_Data) + input.size());
+}
+
+void Serialize_(const String& input, internal::Buffer* buf,
+                internal::String_Data** output) {
+  if (input) {
+    internal::String_Data* result =
+        internal::String_Data::New(input.size(), buf);
+    memcpy(result->storage(), input.data(), input.size());
+    *output = result;
+  } else {
+    *output = NULL;
+  }
+}
+
+void Deserialize_(internal::String_Data* input, String* output) {
+  if (input) {
+    String result(input->storage(), input->size());
+    result.Swap(output);
+  } else {
+    output->reset();
+  }
+}
+
+}  // namespace mojo