Whittle down some compositing chicken/egg hacks

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 2974651368daf825cdef56d0d2be1858ff20e09f..e5b5667e13536acb07a33e76de57060479ec9894 100644
--- a/Source/core/rendering/RenderLayerScrollableArea.cpp
+++ b/Source/core/rendering/RenderLayerScrollableArea.cpp
@@ -747,6 +747,13 @@ void RenderLayerScrollableArea::updateAfterStyleChange(const RenderStyle* oldSty
     updateScrollCornerStyle();
     updateResizerAreaSet();
     updateResizerStyle();
+
+    // FIXME: Remove incremental compositing updates after fixing the chicken/egg issues
+    // https://code.google.com/p/chromium/issues/detail?id=343756
+    DisableCompositingQueryAsserts disabler;
+    RenderLayer* layer = this->layer();
+    if (layer->hasCompositedLayerMapping() && layer->compositedLayerMapping()->updateGraphicsLayerConfiguration(GraphicsLayerUpdater::ForceUpdate))
+        layer->compositor()->setCompositingLayersNeedRebuild();
 }
 
 IntSize RenderLayerScrollableArea::clampScrollOffset(const IntSize& scrollOffset) const