Move RenderLayer repainting to repaint-after-layout framework.

Source/core/rendering/RenderBlock.cpp

Index: Source/core/rendering/RenderBlock.cpp
diff --git a/Source/core/rendering/RenderBlock.cpp b/Source/core/rendering/RenderBlock.cpp
index 8f36a8ead64ddd484f3f4e74643f7198ed9348cb..ad9255a4c0d6732b4c6e5b931424b3d2429ae3e8 100644
--- a/Source/core/rendering/RenderBlock.cpp
+++ b/Source/core/rendering/RenderBlock.cpp
@@ -1791,6 +1791,8 @@ void RenderBlock::layoutPositionedObjects(bool relayoutChildren, bool fixedPosit
     for (TrackedRendererListHashSet::iterator it = positionedDescendants->begin(); it != end; ++it) {
         r = *it;
 
+        LayoutRectRecorder recorder(*r);
+
         SubtreeLayoutScope layoutScope(r);
         // A fixed position element with an absolute positioned ancestor has no way of knowing if the latter has changed position. So
         // if this is a fixed position element, mark it for layout if it has an abspos ancestor and needs to move with that ancestor, i.e.
@@ -1832,7 +1834,10 @@ void RenderBlock::layoutPositionedObjects(bool relayoutChildren, bool fixedPosit
             oldLogicalTop = logicalTopForChild(r);
         }
 
-        r->layoutIfNeeded();
+        if (r->needsLayout())
+            r->layout();
+        else
+            r->setShouldDoFullRepaintAfterLayout(true);
 
         // Lay out again if our estimate was wrong.
         if (needsBlockDirectionLocationSetBeforeLayout && logicalTopForChild(r) != oldLogicalTop)