Charge network traffic to the uid of the process using the MediaPlayer.

Change-Id: I2bcb54b8232afd3fc7ee16289f37c7a7b3f23067
related-to-bug: 4517282
diff --git a/include/media/MediaPlayerInterface.h b/include/media/MediaPlayerInterface.h
index 18e8a5f..4328d3c 100644
--- a/include/media/MediaPlayerInterface.h
+++ b/include/media/MediaPlayerInterface.h
@@ -103,6 +103,10 @@
     virtual status_t    initCheck() = 0;
     virtual bool        hardwareOutput() = 0;
 
+    virtual status_t    setUID(uid_t uid) {
+        return INVALID_OPERATION;
+    }
+
     virtual status_t    setDataSource(
             const char *url,
             const KeyedVector<String8, String8> *headers = NULL) = 0;