Convert ManifestManager IPCs to Mojo.

mojo/public/cpp/bindings/string_traits_nullable_string16.h

+// 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 MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_NULLABLE_STRING16_H_
+#define MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_NULLABLE_STRING16_H_
+
+#include "base/strings/nullable_string16.h"
+#include "mojo/public/cpp/bindings/lib/bindings_internal.h"
+#include "mojo/public/cpp/bindings/string_traits.h"
+
+namespace mojo {
+
+template <>
+struct StringTraits<base::NullableString16> {
+  static bool IsNull(const base::NullableString16& input) {
+    return input.is_null();
+  }
+  static void SetToNull(base::NullableString16* output);
+
+  static void* SetUpContext(const base::NullableString16& input);
+  static void TearDownContext(const base::NullableString16& input,
+                              void* context);
+
+  static size_t GetSize(const base::NullableString16& input, void* context);
+
+  static const char* GetData(const base::NullableString16& input,
+                             void* context);
+
+  static bool Read(StringDataView input, base::NullableString16* output);
+};
+
+}  // namespace mojo
+
+#endif  // MOJO_PUBLIC_CPP_BINDINGS_STRING_TRAITS_NULLABLE_STRING16_H_