Set relayoutChildren to 'true' only if size change happens in Table

Source/core/rendering/compositing/GraphicsLayerTreeBuilder.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  * Copyright (C) 2014 Google 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
@@ skipping 51 matching lines @@
 }
 
 void GraphicsLayerTreeBuilder::rebuild(RenderLayer& layer, AncestorInfo info)
 {
     // Make the layer compositing if necessary, and set up clipping and content layers.
     // Note that we can only do work here that is independent of whether the descendant layers
     // have been processed. computeCompositingRequirements() will already have done the paint invalidation if necessary.
 
     layer.stackingNode()->updateLayerListsIfNeeded();
 
-    const bool hasCompositedLayerMapping = layer.hasCompositedLayerMapping();
     CompositedLayerMapping* currentCompositedLayerMapping = layer.compositedLayerMapping();
 
     // If this layer has a compositedLayerMapping, then that is where we place subsequent children GraphicsLayers.
     // Otherwise children continue to append to the child list of the enclosing layer.
     GraphicsLayerVector layerChildren;
     AncestorInfo infoForChildren(info);
-    if (hasCompositedLayerMapping) {
+    if (currentCompositedLayerMapping) {
         infoForChildren.childLayersOfEnclosingCompositedLayer = &layerChildren;
         infoForChildren.enclosingCompositedLayer = &layer;
     }
 
 #if ENABLE(ASSERT)
     LayerListMutationDetector mutationChecker(layer.stackingNode());
 #endif
 
     if (layer.stackingNode()->isStackingContext()) {
         RenderLayerStackingNodeIterator iterator(*layer.stackingNode(), NegativeZOrderChildren);
         while (RenderLayerStackingNode* curNode = iterator.next())
             rebuild(*curNode->layer(), infoForChildren);
 
         // If a negative z-order child is compositing, we get a foreground layer which needs to get parented.
-        if (hasCompositedLayerMapping && currentCompositedLayerMapping->foregroundLayer())
+        if (currentCompositedLayerMapping && currentCompositedLayerMapping->foregroundLayer())
             infoForChildren.childLayersOfEnclosingCompositedLayer->append(currentCompositedLayerMapping->foregroundLayer());
     }
 
     RenderLayerStackingNodeIterator iterator(*layer.stackingNode(), NormalFlowChildren | PositiveZOrderChildren);
     while (RenderLayerStackingNode* curNode = iterator.next())
         rebuild(*curNode->layer(), infoForChildren);
 
-    if (hasCompositedLayerMapping) {
+    if (currentCompositedLayerMapping) {
         bool parented = false;
         if (layer.renderer()->isRenderPart())
             parented = RenderLayerCompositor::parentFrameContentLayers(toRenderPart(layer.renderer()));
 
         if (!parented)
             currentCompositedLayerMapping->parentForSublayers()->setChildren(layerChildren);
 
         // If the layer has a clipping layer the overflow controls layers will be siblings of the clipping layer.
         // Otherwise, the overflow control layers are normal children.
         // FIXME: Why isn't this handled in CLM updateInternalHierarchy?
@@ skipping 11 matching lines @@
             if (GraphicsLayer* overflowControlLayer = currentCompositedLayerMapping->layerForScrollCorner()) {
                 overflowControlLayer->removeFromParent();
                 currentCompositedLayerMapping->parentForSublayers()->addChild(overflowControlLayer);
             }
         }
 
         if (shouldAppendLayer(layer))
             info.childLayersOfEnclosingCompositedLayer->append(currentCompositedLayerMapping->childForSuperlayers());
     }
 
-    if (layer.scrollParent()
-        && layer.scrollParent()->hasCompositedLayerMapping()
-        && layer.scrollParent()->compositedLayerMapping()->needsToReparentOverflowControls()
-        && layer.scrollParent()->scrollableArea()->topmostScrollChild() == &layer)
-        info.childLayersOfEnclosingCompositedLayer->append(layer.scrollParent()->compositedLayerMapping()->detachLayerForOverflowControls(*info.enclosingCompositedLayer));
+    if (!layer.scrollParent())
+        return;
+
+    CompositedLayerMapping* scrollParentCompositedLayerMapping = layer.scrollParent()->compositedLayerMapping();
+    if (layer.scrollParent()->scrollableArea()->topmostScrollChild() == &layer
+        &&scrollParentCompositedLayerMapping
+        && scrollParentCompositedLayerMapping->needsToReparentOverflowControls())
+        info.childLayersOfEnclosingCompositedLayer->append(scrollParentCompositedLayerMapping->detachLayerForOverflowControls(*info.enclosingCompositedLayer));
 }
 
 }