GitLab

Add a return value to indicate if suggestion was allowed. Also fix
associated test.

Bug: 898990
Change-Id: I22f00cef28dc5a82d431cc49191e956e47cd5e40
Reviewed-on: https://chromium-review.googlesource.com/c/1341148Reviewed-by: Hiroshi Ichikawa <ichikawa@chromium.org>
Commit-Queue: John Wu <jzw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#609175}