[chrome.dial] Adds chrome.dial.fetchDeviceDecription API.

chrome/browser/extensions/api/dial/dial_device_data.h

 // Copyright (c) 2012 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_BROWSER_EXTENSIONS_API_DIAL_DIAL_DEVICE_DATA_H_
 #define CHROME_BROWSER_EXTENSIONS_API_DIAL_DIAL_DEVICE_DATA_H_
 
 #include <string>
 #include <vector>
 
@@ skipping 74 matching lines @@
   // The time that the most recent response was received.
   base::Time response_time_;
 
   // Optional (-1 means unset).
   int max_age_;
 
   // Optional (-1 means unset).
   int config_id_;
 };
 
+struct DialDeviceDescriptionData {
+ public:
+  DialDeviceDescriptionData() = default;
+  DialDeviceDescriptionData(const std::string& device_description,
+                            const GURL& app_url);
+
+  std::string device_description;
+  GURL app_url;
+};
+
 }  // namespace dial
 }  // namespace api
 }  // namespace extensions
 
 #endif  // CHROME_BROWSER_EXTENSIONS_API_DIAL_DIAL_DEVICE_DATA_H_