Cache QX11Info::appRootWindow in eventFilter
appRootWindow is (relatively) expensive and won't change. nativeEventFilter is called a lot This should speed things up. CCBUG: 356479 REVIEW: 126818
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appRootWindow is (relatively) expensive and won't change. nativeEventFilter is called a lot This should speed things up. CCBUG: 356479 REVIEW: 126818