Add missing commit change footer

Bug: 1050795
Cr-Original-Commit-Position: refs/heads/master@{#740010}
Cr-Mirrored-From: https://chromium.googlesource.com/chromium/src
Cr-Mirrored-Commit: 11f7850f086ac1f4fbf9eb4bc868024f194764d8

whitespace_file.txt

@@ -180,3 +180,5 @@ So many books, so little time.
 
 Hi there, it's my first commit.
 !false isn't funny because it's true.
+
+Lalala