Add missing file ddmlib.tar.gz.sha1

Bug:
Change-Id: I3a9135fc9008c2ea05af12fa073101556dcb84ae
diff --git a/third_party/ddmlib.tar.gz.sha1 b/third_party/ddmlib.tar.gz.sha1
new file mode 100644
index 0000000..6c24762
--- /dev/null
+++ b/third_party/ddmlib.tar.gz.sha1
@@ -0,0 +1 @@
+487d9ad2b151e11904cdfd27dc699debf7e5700a
\ No newline at end of file