Re-land: Convert the utility process JSON parser into a Mojo service.

components/safe_json/safe_json_parser_message_filter.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 "components/safe_json/safe_json_parser_message_filter.h"
-
-#include <memory>
-#include <utility>
-
-#include "base/json/json_reader.h"
-#include "base/values.h"
-#include "components/safe_json/safe_json_parser_messages.h"
-#include "content/public/utility/utility_thread.h"
-#include "ipc/ipc_message.h"
-
-namespace {
-
-bool Send(IPC::Message* message) {
-  return content::UtilityThread::Get()->Send(message);
-}
-
-}  // namespace
-
-namespace safe_json {
-
-SafeJsonParserMessageFilter::SafeJsonParserMessageFilter() {
-}
-SafeJsonParserMessageFilter::~SafeJsonParserMessageFilter() {
-}
-
-bool SafeJsonParserMessageFilter::OnMessageReceived(
-    const IPC::Message& message) {
-  bool handled = true;
-  IPC_BEGIN_MESSAGE_MAP(SafeJsonParserMessageFilter, message)
-    IPC_MESSAGE_HANDLER(SafeJsonParserMsg_ParseJSON, OnParseJSON)
-    IPC_MESSAGE_UNHANDLED(handled = false)
-  IPC_END_MESSAGE_MAP()
-
-  return handled;
-}
-
-void SafeJsonParserMessageFilter::OnParseJSON(const std::string& json) {
-  int error_code;
-  std::string error;
-  std::unique_ptr<base::Value> value = base::JSONReader::ReadAndReturnError(
-      json, base::JSON_PARSE_RFC, &error_code, &error);
-  if (value) {
-    base::ListValue wrapper;
-    wrapper.Append(std::move(value));
-    Send(new SafeJsonParserHostMsg_ParseJSON_Succeeded(wrapper));
-  } else {
-    Send(new SafeJsonParserHostMsg_ParseJSON_Failed(error));
-  }
-
-  content::UtilityThread::Get()->ReleaseProcessIfNeeded();
-}
-
-}  // namespace safe_json