Add getFeatures() for get device supporting features

-Provide supported features of the route

Bug: 155822415
Test: build pass
Change-Id: Id3a95f608018ecfae30dc0df9217548f90953403

packages/SettingsLib/src/com/android/settingslib/media/MediaDevice.java

@@ -46,6 +46,7 @@ import com.android.settingslib.R;
 
 import java.lang.annotation.Retention;
 import java.lang.annotation.RetentionPolicy;
+import java.util.List;
 
 /**
  * MediaDevice represents a media device(such like Bluetooth device, cast device and phone device).
@@ -353,6 +354,13 @@ public abstract class MediaDevice implements Comparable<MediaDevice> {
         }
     }
 
+    /**
+     * Gets the supported features of the route.
+     */
+    public List<String> getFeatures() {
+        return mRouteInfo.getFeatures();
+    }
+
     /**
      * Check if it is CarKit device
      * @return true if it is CarKit device