Revert of Remove FOUC avoidance from BlockPainter and DeprecatedPaintLayerPainter.

Source/core/dom/Document.cpp

Index: Source/core/dom/Document.cpp
diff --git a/Source/core/dom/Document.cpp b/Source/core/dom/Document.cpp
index a6b44f96311547563a39b13d928aa08c8d4c6a01..8900974ee35a7f71134db584b77912b23a1d0b27 100644
--- a/Source/core/dom/Document.cpp
+++ b/Source/core/dom/Document.cpp
@@ -3381,8 +3381,15 @@
 {
     styleEngine().resolverChanged(updateMode);
 
-    if (m_pendingSheetLayout == DidLayoutWithPendingSheets && !styleEngine().hasPendingSheets())
+    if (didLayoutWithPendingStylesheets() && !styleEngine().hasPendingSheets()) {
+        // We need to manually repaint because we avoid doing all repaints in layout or style
+        // recalc while sheets are still loading to avoid FOUC.
         m_pendingSheetLayout = IgnoreLayoutWithPendingSheets;
+
+        ASSERT(layoutView() || importsController());
+        if (layoutView())
+            layoutView()->invalidatePaintForViewAndCompositedLayers();
+    }
 }
 
 void Document::styleResolverMayHaveChanged()