[Media Router] Parse device description xml in utility process

chrome/utility/media_router/dial_device_description_parser_impl.h

+// Copyright 2017 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 CHROME_UTILITY_MEDIA_ROUTER_DIAL_DEVICE_DESCRIPTION_PARSER_IMPL_H_
+#define CHROME_UTILITY_MEDIA_ROUTER_DIAL_DEVICE_DESCRIPTION_PARSER_IMPL_H_
+
+#include "base/macros.h"
+#include "chrome/common/media_router/dial_device_description_parser.mojom.h"
+
+namespace media_router {
+
+// Implementation of Mojo DialDeviceDescriptionParser. It accepts device
+// description parsing request from browser process, and handles it in utility
+// process. Class must be created and destroyed on utility thread.
+class DialDeviceDescriptionParserImpl
+    : public chrome::mojom::DialDeviceDescriptionParser {
+ public:
+  DialDeviceDescriptionParserImpl();
+  ~DialDeviceDescriptionParserImpl() override;
+
+  static void Create(chrome::mojom::DialDeviceDescriptionParserRequest request);
+
+ private:
+  friend class DialDeviceDescriptionParserImplTest;
+
+  // extensions::mojom::DialDeviceDescriptionParser:
+  void ParseDialDeviceDescription(
+      const std::string& device_description_xml_data,
+      const ParseDialDeviceDescriptionCallback& callback) override;
+
+  // Processes the result of getting device description. Returns valid
+  // DialDeviceDescriptionPtr if processing succeeds; otherwise returns nullptr.
+  // |xml|: The device description xml text.
+  chrome::mojom::DialDeviceDescriptionPtr Parse(const std::string& xml);
+
+  base::ThreadChecker thread_checker_;
+
+  DISALLOW_COPY_AND_ASSIGN(DialDeviceDescriptionParserImpl);
+};
+
+}  // namespace media_router
+
+#endif  // CHROME_UTILITY_MEDIA_ROUTER_DIAL_DEVICE_DESCRIPTION_PARSER_IMPL_H_