libmediaplayerservice: get isStreaming info from source.

Bug: 19061436
Change-Id: I0fc0d6207b0d3297d64aadab3e81448e3f3fa1de
diff --git a/media/libmediaplayerservice/nuplayer/NuPlayerSource.h b/media/libmediaplayerservice/nuplayer/NuPlayerSource.h
index ef1ba13..11a6a9f 100644
--- a/media/libmediaplayerservice/nuplayer/NuPlayerSource.h
+++ b/media/libmediaplayerservice/nuplayer/NuPlayerSource.h
@@ -118,6 +118,10 @@
         return false;
     }
 
+    virtual bool isStreaming() const {
+        return true;
+    }
+
 protected:
     virtual ~Source() {}