GitLab

This change fixes an issue where ChromeVox would interrupt itself when
reading text content. The cause for this is that we previously restarted
the nudge timer when a focus event fired. This works for buttons, but
focus events do not fire when range moves between text content.
Instead of restarting nudges when a focus event fires, do so when the
current ChromeVox range changes.

A test is also included to confirm behavior.

Bug: 1141643
Change-Id: I8245e98b40398a1964bf33b1a14e16ff7e6889a9
AX-Relnotes: N/A
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2503635Reviewed-by: David Tseng <dtseng@chromium.org>
Commit-Queue: Akihiro Ota <akihiroota@chromium.org>
Cr-Commit-Position: refs/heads/master@{#822877}