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This requires adding support to context menus to close without animation,
otherwise it will still be visible as the default close has a fade out
animation, and the screenshot will capture a near-opaque version of the
menu.

Accelerators by default will also close menus with fade out, so add the
desk activation acclerator to the exception list and let the desk
animation code handle the closing.

Fixed: 991939
Test: manual
Change-Id: I273042a216c651022215929594a2cedd1efecc82
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2586013
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836362}