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

Source/core/page/scrolling/ScrollingCoordinator.cpp

 /*
  * Copyright (C) 2011 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 181 matching lines @@
 }
 
 static void clearPositionConstraintExceptForLayer(GraphicsLayer* layer, GraphicsLayer* except)
 {
     if (layer && layer != except && toWebLayer(layer))
         toWebLayer(layer)->setPositionConstraint(WebLayerPositionConstraint());
 }
 
 static WebLayerPositionConstraint computePositionConstraint(const RenderLayer* layer)
 {
-    ASSERT(layer->hasCompositedLayerMapping());
+    ASSERT(layer->compositedLayerMapping());
     do {
         if (layer->renderer()->style()->position() == FixedPosition) {
             const RenderObject* fixedPositionObject = layer->renderer();
             bool fixedToRight = !fixedPositionObject->style()->right().isAuto();
             bool fixedToBottom = !fixedPositionObject->style()->bottom().isAuto();
             return WebLayerPositionConstraint::fixedPosition(fixedToRight, fixedToBottom);
         }
 
         layer = layer->parent();
 
         // Composited layers that inherit a fixed position state will be positioned with respect to the nearest compositedLayerMapping's GraphicsLayer.
         // So, once we find a layer that has its own compositedLayerMapping, we can stop searching for a fixed position RenderObject.
-    } while (layer && !layer->hasCompositedLayerMapping());
+    } while (layer && !layer->compositedLayerMapping());
     return WebLayerPositionConstraint();
 }
 
 void ScrollingCoordinator::updateLayerPositionConstraint(RenderLayer* layer)
 {
-    ASSERT(layer->hasCompositedLayerMapping());
     CompositedLayerMapping* compositedLayerMapping = layer->compositedLayerMapping();
+    ASSERT(compositedLayerMapping);
     GraphicsLayer* mainLayer = compositedLayerMapping->childForSuperlayers();
 
     // Avoid unnecessary commits
     clearPositionConstraintExceptForLayer(compositedLayerMapping->squashingContainmentLayer(), mainLayer);
     clearPositionConstraintExceptForLayer(compositedLayerMapping->ancestorClippingLayer(), mainLayer);
     clearPositionConstraintExceptForLayer(compositedLayerMapping->mainGraphicsLayer(), mainLayer);
 
     if (WebLayer* scrollableLayer = toWebLayer(mainLayer))
         scrollableLayer->setPositionConstraint(computePositionConstraint(layer));
 }
@@ skipping 366 matching lines @@
     RenderView* renderView = m_page->deprecatedLocalMainFrame()->contentRenderer();
     if (renderView && renderView->compositor() && renderView->compositor()->staleInCompositingMode())
         m_page->deprecatedLocalMainFrame()->view()->scheduleAnimation();
 
     m_touchEventTargetRectsAreDirty = true;
 }
 
 void ScrollingCoordinator::updateScrollParentForGraphicsLayer(GraphicsLayer* child, RenderLayer* parent)
 {
     WebLayer* scrollParentWebLayer = nullptr;
-    if (parent && parent->hasCompositedLayerMapping())
-        scrollParentWebLayer = toWebLayer(parent->compositedLayerMapping()->scrollingContentsLayer());
+
+    if (parent) {
+        CompositedLayerMapping* compositedLayerMapping = parent->compositedLayerMapping();
+        if (compositedLayerMapping)
+            scrollParentWebLayer = toWebLayer(compositedLayerMapping->scrollingContentsLayer());
+    }
 
     child->setScrollParent(scrollParentWebLayer);
 }
 
 void ScrollingCoordinator::updateClipParentForGraphicsLayer(GraphicsLayer* child, RenderLayer* parent)
 {
     WebLayer* clipParentWebLayer = nullptr;
-    if (parent && parent->hasCompositedLayerMapping())
-        clipParentWebLayer = toWebLayer(parent->compositedLayerMapping()->parentForSublayers());
+
+    if (parent) {
+        CompositedLayerMapping* compositedLayerMapping = parent->compositedLayerMapping();
+        if (compositedLayerMapping)
+            clipParentWebLayer = toWebLayer(compositedLayerMapping->parentForSublayers());
+    }
 
     child->setClipParent(clipParentWebLayer);
 }
 
 void ScrollingCoordinator::willDestroyRenderLayer(RenderLayer* layer)
 {
     m_layersWithTouchRects.remove(layer);
 }
 
 void ScrollingCoordinator::updateHaveWheelEventHandlers()
@@ skipping 362 matching lines @@
     bool frameIsScrollable = frameView && frameView->isScrollable();
     if (frameIsScrollable != m_wasFrameScrollable)
         return true;
 
     if (WebLayer* scrollLayer = frameView ? toWebLayer(frameView->layerForScrolling()) : nullptr)
         return blink::WebSize(frameView->contentsSize()) != scrollLayer->bounds();
     return false;
 }
 
 } // namespace blink