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Taking activation upon long alt-tab can affect the foreground
application, e.g. pausing video.

Note that ChromeVox only works for activated windows, so we leave
the cycler activatable if ChromeVox is on.

Bug: b/138914552
Test: Netflix does not pause when alt-tabbing
Change-Id: Idb5ff6db56f9eaa3141140eacebc2bfea6bc3bab
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1905290Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Kazuki Takise <takise@chromium.org>
Auto-Submit: Kazuki Takise <takise@chromium.org>
Cr-Commit-Position: refs/heads/master@{#714784}