vector/README.libaom: add Chromium required fields

Bug: 421989177
Fixed: 421989177
Change-Id: I2f77bb15d5204a34d239b13df9843f121d1e5628

third_party/vector/README.libaom

diff --git a/third_party/vector/README.libaom b/third_party/vector/README.libaom
index 4b6e4dd..ebd43d2 100644
--- a/third_party/vector/README.libaom
+++ b/third_party/vector/README.libaom
@@ -3,6 +3,8 @@
 Version: commit-id: 40efe82
 License: MIT
 License File: LICENSE
+Shipped in Chromium: yes
+Security Critical: yes
 
 Description:
 A feature-complete, generic and customizable resizable