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

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

Index: chrome/browser/extensions/api/dial/dial_device_data.cc
diff --git a/chrome/browser/extensions/api/dial/dial_device_data.cc b/chrome/browser/extensions/api/dial/dial_device_data.cc
index 8c93aceabce4d1ef3c59a9933ea3305b366d30ea..1db2e5c38b51a53b82e63598c7b469aaf90acdc9 100644
--- a/chrome/browser/extensions/api/dial/dial_device_data.cc
+++ b/chrome/browser/extensions/api/dial/dial_device_data.cc
@@ -57,6 +57,11 @@ void DialDeviceData::FillDialDevice(api::dial::DialDevice* device) const {
     device->config_id.reset(new int(config_id_));
 }
 
+DialDeviceDescriptionData::DialDeviceDescriptionData(
+    const std::string& device_description,
+    const GURL& app_url)
+    : device_description(device_description), app_url(app_url) {}
+
 }  // namespace dial
 }  // namespace api
 }  // namespace extensions