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

Source/core/rendering/RenderLayerScrollableArea.cpp

Index: Source/core/rendering/RenderLayerScrollableArea.cpp
diff --git a/Source/core/rendering/RenderLayerScrollableArea.cpp b/Source/core/rendering/RenderLayerScrollableArea.cpp
index d61144d26f7814ff6db932f4099e431361ea5cfc..e3fab35c0717eebbe301ce0c9ab244d9bd591b28 100644
--- a/Source/core/rendering/RenderLayerScrollableArea.cpp
+++ b/Source/core/rendering/RenderLayerScrollableArea.cpp
@@ -153,7 +153,8 @@ HostWindow* RenderLayerScrollableArea::hostWindow() const
 
 GraphicsLayer* RenderLayerScrollableArea::layerForScrolling() const
 {
-    return layer()->hasCompositedLayerMapping() ? layer()->compositedLayerMapping()->scrollingContentsLayer() : 0;
+    CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping();
+    return compositedLayerMapping ? compositedLayerMapping->scrollingContentsLayer() : 0;
 }
 
 GraphicsLayer* RenderLayerScrollableArea::layerForHorizontalScrollbar() const
@@ -161,7 +162,8 @@ GraphicsLayer* RenderLayerScrollableArea::layerForHorizontalScrollbar() const
     // See crbug.com/343132.
     DisableCompositingQueryAsserts disabler;
 
-    return layer()->hasCompositedLayerMapping() ? layer()->compositedLayerMapping()->layerForHorizontalScrollbar() : 0;
+    CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping();
+    return compositedLayerMapping ? compositedLayerMapping->layerForHorizontalScrollbar() : 0;
 }
 
 GraphicsLayer* RenderLayerScrollableArea::layerForVerticalScrollbar() const
@@ -169,7 +171,8 @@ GraphicsLayer* RenderLayerScrollableArea::layerForVerticalScrollbar() const
     // See crbug.com/343132.
     DisableCompositingQueryAsserts disabler;
 
-    return layer()->hasCompositedLayerMapping() ? layer()->compositedLayerMapping()->layerForVerticalScrollbar() : 0;
+    CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping();
+    return compositedLayerMapping ? compositedLayerMapping->layerForVerticalScrollbar() : 0;
 }
 
 GraphicsLayer* RenderLayerScrollableArea::layerForScrollCorner() const
@@ -177,7 +180,8 @@ GraphicsLayer* RenderLayerScrollableArea::layerForScrollCorner() const
     // See crbug.com/343132.
     DisableCompositingQueryAsserts disabler;
 
-    return layer()->hasCompositedLayerMapping() ? layer()->compositedLayerMapping()->layerForScrollCorner() : 0;
+    CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping();
+    return compositedLayerMapping ? compositedLayerMapping->layerForScrollCorner() : 0;
 }
 
 void RenderLayerScrollableArea::invalidateScrollbarRect(Scrollbar* scrollbar, const IntRect& rect)
@@ -993,8 +997,8 @@ void RenderLayerScrollableArea::positionOverflowControls(const IntSize& offsetFr
     // FIXME, this should eventually be removed, once we are certain that composited
     // controls get correctly positioned on a compositor update. For now, conservatively
     // leaving this unchanged.
-    if (layer()->hasCompositedLayerMapping())
-        layer()->compositedLayerMapping()->positionOverflowControlsLayers(offsetFromRoot);
+    if (CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping())
+        compositedLayerMapping->positionOverflowControlsLayers(offsetFromRoot);
 }
 
 void RenderLayerScrollableArea::updateScrollCornerStyle()
@@ -1447,8 +1451,9 @@ void RenderLayerScrollableArea::updateCompositingLayersAfterScroll()
     if (compositor->inCompositingMode()) {
         if (usesCompositedScrolling()) {
             DisableCompositingQueryAsserts disabler;
-            ASSERT(layer()->hasCompositedLayerMapping());
-            layer()->compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
+            CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping();
+            ASSERT(compositedLayerMapping);
+            compositedLayerMapping->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
             compositor->setNeedsCompositingUpdate(CompositingUpdateAfterGeometryChange);
         } else {
             layer()->setNeedsCompositingInputsUpdate();
@@ -1464,7 +1469,9 @@ bool RenderLayerScrollableArea::usesCompositedScrolling() const
 
     // See https://codereview.chromium.org/176633003/ for the tests that fail without this disabler.
     DisableCompositingQueryAsserts disabler;
-    return layer()->hasCompositedLayerMapping() && layer()->compositedLayerMapping()->scrollingLayer();
+
+    CompositedLayerMapping* compositedLayerMapping = layer()->compositedLayerMapping();
+    return compositedLayerMapping && compositedLayerMapping->scrollingLayer();
 }
 
 static bool layerNeedsCompositedScrolling(const RenderLayer* layer)