Add a FOUC painting test.

Source/platform/graphics/GraphicsLayer.cpp

 /*
  * Copyright (C) 2009 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.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 46 matching lines @@
 #include "wtf/HashSet.h"
 #include "wtf/text/WTFString.h"
 #include <algorithm>
 
 #ifndef NDEBUG
 #include <stdio.h>
 #endif
 
 namespace blink {
 
+static bool s_drawDebugRedFill = true;
+
 // TODO(wangxianzhu): Remove this when we no longer invalidate rects.
 struct PaintInvalidationTrackingInfo {
     Vector<FloatRect> invalidationRects;
     Vector<String> invalidationObjects;
 };
 
 typedef HashMap<const GraphicsLayer*, PaintInvalidationTrackingInfo> PaintInvalidationTrackingMap;
 static PaintInvalidationTrackingMap& paintInvalidationTrackingMap()
 {
     DEFINE_STATIC_LOCAL(PaintInvalidationTrackingMap, map, ());
@@ skipping 65 matching lines @@
     if (m_replicatedLayer)
         m_replicatedLayer->setReplicatedByLayer(0);
 
     removeAllChildren();
     removeFromParent();
 
     resetTrackedPaintInvalidations();
     ASSERT(!m_parent);
 }
 
+void GraphicsLayer::setDrawDebugRedFillForTesting(bool enabled)
+{
+    s_drawDebugRedFill = enabled;
+}
+
 void GraphicsLayer::setParent(GraphicsLayer* layer)
 {
     ASSERT(!layer || !layer->hasAncestor(this));
     m_parent = layer;
 }
 
 #if ENABLE(ASSERT)
 
 bool GraphicsLayer::hasAncestor(GraphicsLayer* ancestor) const
 {
@@ skipping 121 matching lines @@
 }
 
 void GraphicsLayer::paintGraphicsLayerContents(GraphicsContext& context, const IntRect& clip)
 {
     if (!m_client)
         return;
     if (firstPaintInvalidationTrackingEnabled())
         m_debugInfo.clearAnnotatedInvalidateRects();
     incrementPaintCount();
 #ifndef NDEBUG
-    if (m_displayItemList && contentsOpaque()) {
+    if (m_displayItemList && contentsOpaque() && s_drawDebugRedFill) {
         ASSERT(RuntimeEnabledFeatures::slimmingPaintEnabled());
         FloatRect rect(FloatPoint(), size());
         if (!DrawingRecorder::useCachedDrawingIfPossible(context, *this, DisplayItem::DebugRedFill)) {
             DrawingRecorder recorder(context, *this, DisplayItem::DebugRedFill, rect);
             context.fillRect(rect, SK_ColorRED);
         }
     }
 #endif
     m_client->paintContents(this, context, m_paintingPhase, clip);
 }
@@ skipping 149 matching lines @@
 {
     clearContentsLayerIfUnregistered();
     return m_contentsLayer;
 }
 
 void GraphicsLayer::resetTrackedPaintInvalidations()
 {
     paintInvalidationTrackingMap().remove(this);
 }
 
+bool GraphicsLayer::hasTrackedPaintInvalidations() const
+{
+    PaintInvalidationTrackingMap::iterator it = paintInvalidationTrackingMap().find(this);
+    if (it != paintInvalidationTrackingMap().end())
+        return !it->value.invalidationRects.isEmpty();
+    return false;
+}
+
 void GraphicsLayer::trackPaintInvalidationRect(const FloatRect& rect)
 {
     if (rect.isEmpty())
         return;
 
     // The caller must check isTrackingPaintInvalidations() before calling this method
     // to avoid constructing the rect unnecessarily.
     ASSERT(isTrackingPaintInvalidations());
 
     paintInvalidationTrackingMap().add(this, PaintInvalidationTrackingInfo()).storedValue->value.invalidationRects.append(rect);
@@ skipping 683 matching lines @@
 {
     if (!layer) {
         fprintf(stderr, "Cannot showGraphicsLayerTree for (nil).\n");
         return;
     }
 
     String output = layer->layerTreeAsText(blink::LayerTreeIncludesDebugInfo);
     fprintf(stderr, "%s\n", output.utf8().data());
 }
 #endif