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If we want to re-enable SanityTest.jsm test, we need to disable native compositor(DirectComposition) on the testing window, since taking snapshot of native compositor is very slow on Windows. Then CompositorOptions could be used to notice to disable native compositor(DirectComposition). To notice it from SanityTest.jsm to gecko, nsIAppWindow::needFastSnaphot() is used. Differential Revision: https://phabricator.services.mozilla.com/D130824