Added atwilson as an OWNER of components/policy/resouces.

BUG=None

Review URL: https://codereview.chromium.org/599373002

Cr-Commit-Position: refs/heads/master@{#296698}

components/policy/resources/OWNERS

@@ -6,5 +6,6 @@
 # The rules are documented at:
 # https://sites.google.com/a/chromium.org/dev/developers/how-tos/enterprise/adding-new-policies
 per-file policy_templates.json=set noparent
+per-file policy_templates.json=atwilson@chromium.org
 per-file policy_templates.json=bartfab@chromium.org
 per-file policy_templates.json=joaodasilva@chromium.org