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x11: Fix laggy scrolling in Firefox when swap events are disabled

Vlad Zahorodnii requested to merge work/firefox-scrolling-issues into master

On Intel, scrolling in Firefox is laggy if swap events are disabled. The culprit seems to be the fact that the SGIVideoSyncVsyncMonitor watches for vblanks on the root window. This change addresses the issue by creating a dummy window that is used later to make the opengl context current and watching vblanks.

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