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AT-SPI sets up a number of ATK event listeners. If Chromium emits
events too early, they won't be detected by AT-SPI.

The initialization of AT-SPI listeners happens at
spi_atk_register_event_listeners in the at-spi2-atk library. It also
sets up a key event listener, which is registered by Chromium at
AtkUtilAuraLinuxAddKeyEventListener. We use the registration of the
key event listener as an indication of AT-SPI being ready, due to our
internal knowledge of the internals of the AT-SPI/ATK bridge.

If there are no key event listeners, we consider AT-SPI is not ready,
so window activated events are queued. As soon as a key event
listener is registered, events will be run and never queued again.
A window deactivated event would cancel the queued activated event.

Bug: 1062755
Change-Id: I2d1a1516bed2b8437df664d69399b72af02eb4a8
AX-Relnotes: Linux: send Chromium's first window activation event.
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2312818Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Jacobo Aragunde Pérez <jaragunde@igalia.com>
Cr-Commit-Position: refs/heads/master@{#800502}