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This allows desktop capture to also include the mouse cursor without
having to induce a separate compositing stage for desktop capture
itself.

Bug: b:38452042
Change-Id: Ibfa75454ef44b8329d643dcfcc94a1b7b65018e4
Reviewed-on: https://chromium-review.googlesource.com/899606
Commit-Queue: Jeffrey Kardatzke <jkardatzke@google.com>
Reviewed-by: Ahmed Fakhry <afakhry@chromium.org>
Reviewed-by: Dan Erat <derat@chromium.org>
Cr-Commit-Position: refs/heads/master@{#534215}