QMediaPlaylist: Added ability to load from provided QNetworkRequest.

Change-Id: I7d8fc8a432810ff87650808b9ca6af53f7356d4e
Reviewed-by: Dmytro Poplavskiy <dmytro.poplavskiy@nokia.com>

src/multimedia/playback/qmediaplaylist.h

@@ -101,6 +101,7 @@ public:
     bool removeMedia(int start, int end);
     bool clear();
 
+    void load(const QNetworkRequest &request, const char *format = 0);
     void load(const QUrl &location, const char *format = 0);
     void load(QIODevice * device, const char *format = 0);