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TableView would fire a focus event every time the active row or column changed,
e.g. every time an NVDA user would use the arrow keys to navigate around the view.

However, Task Manager updates its displayed information very frequently and so
by the time NVDA would process the focus changed event, the AXVirtualView object corresponding to the focused item
would no longer be available. Task Manager marks every item as changed every time it refreshes its display,
thereby causing the corresponding AXVirtualView object to be destroyed and re-created.

To work around this issue, we delay firing the focus changed event after OnPaint.

R=dmazzoni@chromium.org, sky@chromium.org

Bug: 811277
Change-Id: I941cda49fefdc5becdbd7baf8f2cca26104d1aa9
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1930061Reviewed-by: Scott Violet <sky@chromium.org>
Reviewed-by: Dominic Mazzoni <dmazzoni@chromium.org>
Commit-Queue: Nektarios Paisios <nektar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#719175}