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When keydown event is triggered continuously,
mousedown event cause keydown event as not repeating event.

This change append check logic to exclude mouse button flags.

Bug: 1114281
Change-Id: Ie967e34cbc13c2489ccba4945cb4ae0dcbce0deb
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2368577Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Reviewed-by: Mustaq Ahmed <mustaq@chromium.org>
Commit-Queue: Mustaq Ahmed <mustaq@chromium.org>
Cr-Commit-Position: refs/heads/master@{#804943}