NuPlayer: pause playback when buffering is low

also fix buffering percentage report (should be the buffered position)

bug: 18730095
Change-Id: I11e7ca4ba9e772a1ae76861ca1ff1725b62f65ae
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayer.h b/media/libmediaplayerservice/nuplayer/NuPlayer.h
index 1569816..edc2bd3 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayer.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayer.h
@@ -177,6 +177,14 @@
 
     bool mStarted;
 
+    // Actual pause state, either as requested by client or due to buffering.
+    bool mPaused;
+
+    // Pause state as requested by client. Note that if mPausedByClient is
+    // true, mPaused is always true; if mPausedByClient is false, mPaused could
+    // still become true, when we pause internally due to buffering.
+    bool mPausedByClient;
+
     inline const sp<DecoderBase> &getDecoder(bool audio) {
         return audio ? mAudioDecoder : mVideoDecoder;
     }
@@ -204,6 +212,7 @@
 
     void onStart();
     void onResume();
+    void onPause();
 
     bool audioDecoderStillNeeded();