Fragmented mp4 extractor

Still experimental. Set property "media.stagefright.use-fragmp4" to true to
enable.

Change-Id: I210b9c5b5164b5c5eefc31309845ee881ac7db8e
diff --git a/media/libmediaplayerservice/nuplayer/mp4/MP4Source.cpp b/media/libmediaplayerservice/nuplayer/mp4/MP4Source.cpp
index c80d13f..ffb3a65 100644
--- a/media/libmediaplayerservice/nuplayer/mp4/MP4Source.cpp
+++ b/media/libmediaplayerservice/nuplayer/mp4/MP4Source.cpp
@@ -93,6 +93,10 @@
         return total;
     }
 
+    bool isSeekable() {
+        return false;
+    }
+
 private:
     sp<NuPlayer::NuPlayerStreamListener> mListener;
     off64_t mPosition;