MTP: Implement GetNumObjects

Change-Id: Iccc3a445f9a1eab7bb76eddd567c6a3a8f155b2b
Signed-off-by: Mike Lockwood <lockwood@android.com>
diff --git a/media/mtp/MtpDatabase.h b/media/mtp/MtpDatabase.h
index a17797e..bbbbc38 100644
--- a/media/mtp/MtpDatabase.h
+++ b/media/mtp/MtpDatabase.h
@@ -47,6 +47,10 @@
                                             MtpObjectFormat format,
                                             MtpObjectHandle parent) = 0;
 
+    virtual int                     getNumObjects(MtpStorageID storageID,
+                                            MtpObjectFormat format,
+                                            MtpObjectHandle parent) = 0;
+
     virtual MtpResponseCode         getObjectProperty(MtpObjectHandle handle,
                                             MtpObjectProperty property,
                                             MtpDataPacket& packet) = 0;