Revert of Remove FOUC avoidance from BlockPainter and DeprecatedPaintLayerPainter.

Source/core/testing/Internals.cpp

 /*
  * 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 2316 matching lines @@
 {
     frame()->page()->focusController().setFocused(focused);
 }
 
 void Internals::setInitialFocus(bool reverse)
 {
     frame()->document()->setFocusedElement(nullptr);
     frame()->page()->focusController().setInitialFocus(reverse ? WebFocusTypeBackward : WebFocusTypeForward);
 }
 
+bool Internals::ignoreLayoutWithPendingStylesheets(Document* document)
+{
+    ASSERT(document);
+    return document->ignoreLayoutWithPendingStylesheets();
+}
+
 void Internals::setNetworkStateNotifierTestOnly(bool testOnly)
 {
     networkStateNotifier().setTestUpdatesOnly(testOnly);
 }
 
 void Internals::setNetworkConnectionInfo(const String& type, ExceptionState& exceptionState)
 {
     WebConnectionType webtype;
     if (type == "cellular") {
         webtype = ConnectionTypeCellular;
@@ skipping 128 matching lines @@
 
     return animator->setScrollbarsVisibleForTesting(visible);
 }
 
 void Internals::forceRestrictIFramePermissions()
 {
     RuntimeEnabledFeatures::setRestrictIFramePermissionsEnabled(true);
 }
 
 } // namespace blink