Revert of Remove FOUC avoidance from BlockPainter and DeprecatedPaintLayerPainter.

Source/core/testing/Internals.idl

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 274 matching lines @@
     [CallWith=ScriptState] Promise promiseCheckOverload(Document arg1);
     [CallWith=ScriptState] Promise promiseCheckOverload(Location arg1, long arg2, long arg3);
 
     void setValueForUser(Element element, DOMString value);
 
     DOMString textSurroundingNode(Node node, long x, long y, unsigned long maxLength);
 
     void setFocused(boolean focused);
     void setInitialFocus(boolean reverse);
 
+    [TypeChecking=Interface] boolean ignoreLayoutWithPendingStylesheets(Document document);
+
     // These functions are for testing NetInfo. You must call setNetworkStateNotifierTestOnly(true)
     // before calling setNetworkConnectionInfo.
     void setNetworkStateNotifierTestOnly(boolean testOnly);
     [RaisesException] void setNetworkConnectionInfo(DOMString type);
 
     // This function is for testing HitRegions on Canvas2D.
     unsigned long countHitRegions(CanvasRenderingContext2D context);
 
     [TypeChecking=Interface] boolean isInCanvasFontCache(Document document, DOMString fontString);
     [TypeChecking=Interface] unsigned long canvasFontCacheMaxFonts();
@@ skipping 22 matching lines @@
 
     ClientRectList outlineRects(Element element);
     void setCapsLockState(boolean enabled);
 
     // Returns whether the scrollbar was able to be shown or hidden; not all platforms
     // support overlay scrollbars.
     bool setScrollbarVisibilityInScrollableArea(Node node, boolean visible);
 
     void forceRestrictIFramePermissions();
 };