GitLab

Currently simulated tab events are sent to PDF plugin whenever PDF
plugin is focused. Ensure that simulated tab events are only passed in
case of focus received from tab/shift-tab.

Bug: 989046
Change-Id: I994d401f6896bc7dcb6f41669c38757b52413873
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2224881Reviewed-by: Kevin Babbitt <kbabbitt@microsoft.com>
Reviewed-by: Lei Zhang <thestig@chromium.org>
Reviewed-by: Alex Moshchuk <alexmos@chromium.org>
Commit-Queue: Ankit Kumar 🌪️ <ankk@microsoft.com>
Cr-Commit-Position: refs/heads/master@{#774976}