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There is some ambiguity about whether ScheduleComposite will necessarily trigger a composite all the way to nsWindow::DrawWindowUnderlay. Android robocop tests assume it will, because they rely on DrawWindowOverlay being called so they can take a screenshot and make progress, but this is a very fragile assumption. They also rely on the entire window being painted, which is also a fragile assumption. This patch improves the situation by explicitly invalidating the current window area when Android Java code needs to trigger a composite. This avoids regressions from future patches in this series which make composition bail out when there is nothing invalid. The resulting setup is still a bit fragile for my taste but I'm not sure what the ideal solution would be. --HG-- extra : commitid : 3t3xqRdZs24 extra : rebase_source : b23749613663ca805484776ccf5e36b4ff00e3fe