Optionally have MessagePort pass data as base::Value, part 1.

content/public/common/message_port_message.cc

+// Copyright 2015 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 "content/public/common/message_port_message.h"
+
+namespace content {
+
+MessagePortMessage::MessagePortMessage() {
+}
+
+MessagePortMessage::MessagePortMessage(const base::string16& message)
+    : message_as_string(message) {
+}
+
+MessagePortMessage::MessagePortMessage(const base::Value* message) {
+  message_as_value.Append(message->DeepCopy());
+}
+
+MessagePortMessage::MessagePortMessage(const MessagePortMessage& other) {
+  *this = other;
+}
+
+MessagePortMessage& MessagePortMessage::operator=(
+    const MessagePortMessage& other) {
+  message_as_string = other.message_as_string;
+  message_as_value.Clear();
+  const base::Value* value;
+  if (other.message_as_value.Get(0, &value))
+    message_as_value.Append(value->DeepCopy());
+  return *this;
+}
+
+MessagePortMessage::~MessagePortMessage() {
+}
+
+}  // namespace content