Add myself, Gustav Tiger (Sony), to AUTHORS

BUG=

Review URL: https://codereview.chromium.org/1154103002

Cr-Commit-Position: refs/heads/master@{#331951}
diff --git a/AUTHORS b/AUTHORS
index 88832a36..481689a 100644
--- a/AUTHORS
+++ b/AUTHORS
@@ -191,6 +191,7 @@
 Grzegorz Czajkowski <[email protected]>
 Guangzhen Li <[email protected]>
 Gurpreet Kaur <[email protected]>
+Gustav Tiger <[email protected]>
 Gyuyoung Kim <[email protected]>
 Gzob Qq <[email protected]>
 Habib Virji <[email protected]>