Throttle rendering pipeline for invisible frames

third_party/WebKit/Source/core/layout/LayoutTreeAsText.cpp

 /*
  * Copyright (C) 2004, 2006, 2007 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 645 matching lines @@
     ClipRect damageRect, clipRectToApply;
     layer->clipper().calculateRects(ClipRectsContext(rootLayer, UncachedClipRects), paintRect, layerBounds, damageRect, clipRectToApply);
 
     // Ensure our lists are up-to-date.
     layer->stackingNode()->updateLayerListsIfNeeded();
 
     LayoutPoint offsetFromRoot;
     layer->convertToLayerCoords(rootLayer, offsetFromRoot);
     bool shouldPaint = (behavior & LayoutAsTextShowAllLayers) ? true : layer->intersectsDamageRect(layerBounds, damageRect.rect(), offsetFromRoot);
 
+    if (layer->layoutObject()->isLayoutPart() && toLayoutPart(layer->layoutObject())->isThrottledFrameView())
+        shouldPaint = false;
+
     Vector<PaintLayerStackingNode*>* negList = layer->stackingNode()->negZOrderList();
     bool paintsBackgroundSeparately = negList && negList->size() > 0;
     if (shouldPaint && paintsBackgroundSeparately)
         write(ts, *layer, layerBounds, damageRect.rect(), clipRectToApply.rect(), LayerPaintPhaseBackground, indent, behavior);
 
     if (negList) {
         int currIndent = indent;
         if (behavior & LayoutAsTextShowLayerNesting) {
             writeIndent(ts, indent);
             ts << " negative z-order list(" << negList->size() << ")\n";
@@ skipping 165 matching lines @@
     element->document().updateLayout();
 
     LayoutObject* layoutObject = element->layoutObject();
     if (!layoutObject || !layoutObject->isListItem())
         return String();
 
     return toLayoutListItem(layoutObject)->markerText();
 }
 
 } // namespace blink