Clear the groupedMapping parameter in layers when removed from the group

Source/core/layout/compositing/DeprecatedPaintLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 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 434 matching lines @@
 
         // If we need to issue paint invalidations, do so before allocating the compositedDeprecatedPaintLayerMapping and clearing out the groupedMapping.
         paintInvalidationOnCompositingChange(layer);
 
         // If this layer was previously squashed, we need to remove its reference to a groupedMapping right away, so
         // that computing paint invalidation rects will know the layer's correct compositingState.
         // FIXME: do we need to also remove the layer from it's location in the squashing list of its groupedMapping?
         // Need to create a test where a squashed layer pops into compositing. And also to cover all other
         // sorts of compositingState transitions.
         layer->setLostGroupedMapping(false);
-        layer->setGroupedMapping(nullptr);
+        layer->setGroupedMapping(nullptr, DeprecatedPaintLayer::InvalidateLayerAndRemoveFromMapping);
 
         layer->ensureCompositedDeprecatedPaintLayerMapping();
         compositedDeprecatedPaintLayerMappingChanged = true;
 
         // At this time, the ScrollingCooridnator only supports the top-level frame.
         if (layer->isRootLayer() && m_layoutView.frame()->isLocalRoot()) {
             if (ScrollingCoordinator* scrollingCoordinator = this->scrollingCoordinator())
                 scrollingCoordinator->frameViewRootLayerDidChange(m_layoutView.frameView());
         }
         break;
@@ skipping 740 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink