Switch stagefright's approach to prefetching to the new model. The java MediaPlayer is now notified about rebuffering start/end via info messages.

Change-Id: If8185ba329ce8b6663b1ad39a4efb0ad3be81df2
diff --git a/include/media/mediaplayer.h b/include/media/mediaplayer.h
index 7fad1b7..dc783ce 100644
--- a/include/media/mediaplayer.h
+++ b/include/media/mediaplayer.h
@@ -93,6 +93,11 @@
     // The video is too complex for the decoder: it can't decode frames fast
     // enough. Possibly only the audio plays fine at this stage.
     MEDIA_INFO_VIDEO_TRACK_LAGGING = 700,
+    // MediaPlayer is temporarily pausing playback internally in order to
+    // buffer more data.
+    MEDIA_INFO_BUFFERING_START = 701,
+    // MediaPlayer is resuming playback after filling buffers.
+    MEDIA_INFO_BUFFERING_END = 702,
     // 8xx
     // Bad interleaving means that a media has been improperly interleaved or not
     // interleaved at all, e.g has all the video samples first then all the audio