Support passing headers to MediaMetadataRetriever's setDataSource API

Change-Id: Ib1a5c08fc5034cac05034db27007a35c9b660b26
related-to-bug: 3506316
diff --git a/media/libmediaplayerservice/MidiMetadataRetriever.h b/media/libmediaplayerservice/MidiMetadataRetriever.h
index 73ff347..4cee42d 100644
--- a/media/libmediaplayerservice/MidiMetadataRetriever.h
+++ b/media/libmediaplayerservice/MidiMetadataRetriever.h
@@ -31,7 +31,9 @@
                                    MidiMetadataRetriever() {}
                                    ~MidiMetadataRetriever() {}
 
-    virtual status_t                setDataSource(const char *url);
+    virtual status_t                setDataSource(
+            const char *url, const KeyedVector<String8, String8> *headers);
+
     virtual status_t                setDataSource(int fd, int64_t offset, int64_t length);
     virtual const char*             extractMetadata(int keyCode);