Announce auto complete changes

TBR=seantopping@chromium.org

Bug: b:1528458863
Change-Id: I417e9cbfd56e13faf17f08d60d393eca2dbe0212
Reviewed-on: https://chromium-review.googlesource.com/c/1457420
Commit-Queue: David Tseng <dtseng@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#630360}
9 files changed