Add -l option to `adb sync`

Change-Id: I87c01663dff319dde24b70560e6fe5647ebf9d49
diff --git a/adb/file_sync_service.h b/adb/file_sync_service.h
index 4ee40ba..11ea06b 100644
--- a/adb/file_sync_service.h
+++ b/adb/file_sync_service.h
@@ -79,7 +79,7 @@
 void file_sync_service(int fd, void *cookie);
 int do_sync_ls(const char *path);
 int do_sync_push(const char *lpath, const char *rpath, int verifyApk);
-int do_sync_sync(const char *lpath, const char *rpath);
+int do_sync_sync(const char *lpath, const char *rpath, int listonly);
 int do_sync_pull(const char *rpath, const char *lpath);
 
 #define SYNC_DATA_MAX (64*1024)