Bug 622542. Ensure that the layer tree is updated after NS_DOCUMENT_STATE_WINDOW_INACTIVE has changed. r=tnikkel,a=blocking

layout/base/nsPresShell.cpp

@@ -4996,18 +4996,7 @@ PresShell::DocumentStatesChanged(nsIDocument* aDocument,
   if (aStateMask.HasState(NS_DOCUMENT_STATE_WINDOW_INACTIVE)) {
     nsIFrame* root = FrameManager()->GetRootFrame();
     if (root) {
-      // It's a display root. So, invalidate the layer contents of
-      // everything we can find. We need to do this because the contents
-      // of controls etc can depend on whether the window is active,
-      // and when a window becomes (in)active it just gets repainted
-      // and we don't specifically invalidate each affected control.
-      nsIWidget* widget = root->GetNearestWidget();
-      if (widget) {
-        LayerManager* layerManager = widget->GetLayerManager();
-        if (layerManager) {
-          FrameLayerBuilder::InvalidateAllThebesLayerContents(layerManager);
-        }
-      }
+      root->InvalidateFrameSubtree();
     }
   }
 }