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Some dialog boxes, like the accelerator confirmation dialog that appears
when you press Search+Control+M, focus the dialog and then immediately
after focus one of the buttons. This was causing ChromeVox to suppress
information about the context of the dialog.

Fix this by using PostTask to defer all events from Views. This doesn't
even add any delay, it just pushes the event firing to after the current
call stack so that transient changes get suppressed.

Manually confirmed that the experience with this particular dialog is
improved, other dialogs and views seem to continue to work fine.

Bug: 729449
Change-Id: I278c0c0b1dbdd26a654799fb5b314341942c1373
Reviewed-on: https://chromium-review.googlesource.com/1176207
Commit-Queue: Dominic Mazzoni <dmazzoni@chromium.org>
Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: David Tseng <dtseng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#589201}