Delay scrollContents until the next paint

Source/core/rendering/RenderLayer.cpp

Index: Source/core/rendering/RenderLayer.cpp
diff --git a/Source/core/rendering/RenderLayer.cpp b/Source/core/rendering/RenderLayer.cpp
index 512b4828f3961fc5612afcd8233161d04854eaad..64987ff8de0ba188c33db0d5b012fffe87ea8456 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -500,7 +500,9 @@ void RenderLayer::updateLayerPositionsAfterScroll(RenderGeometryMap* geometryMap
         // https://code.google.com/p/chromium/issues/detail?id=343756
         DisableCompositingQueryAsserts disabler;
         // FIXME: We could track the repaint container as we walk down the tree.
-        repainter().computeRepaintRects(renderer()->containerForRepaint(), geometryMap);
+        // repainter().computeRepaintRects(renderer()->containerForRepaint(), geometryMap);
+        // FIXME: This may cause extra repaints.
+        repainter().repaintIncludingNonCompositingDescendants(renderer()->containerForRepaint());

[abarth-chromium, 2014/03/08 06:54:52]

I'm not sure I understand what's changing here...

     } else {
         // Check that RenderLayerRepainter's cached rects are correct.
         // FIXME: re-enable these assertions when the issue with table cells is resolved: https://bugs.webkit.org/show_bug.cgi?id=103432