Add drott to core/OWNERS

Add drott as core OWNER following successful nomination.

Change-Id: Id2b25adb545275ac6fb43acc4acf2f7781bb9f1b
Reviewed-on: https://chromium-review.googlesource.com/595976Reviewed-by: Rune Lillesveen <rune@opera.com>
Commit-Queue: Emil A Eklund <eae@chromium.org>
Cr-Commit-Position: refs/heads/master@{#491054}

third_party/WebKit/Source/core/OWNERS

@@ -17,6 +17,8 @@ dtapuska@chromium.org
 dgozman@chromium.org
 dominicc@chromium.org
 dpranke@chromium.org
+# drott reviews font specific changes.
+drott@chromium.org
 dsinclair@chromium.org
 dstockwell@chromium.org
 eae@chromium.org