Repaint squashing content in cases where the entire frame is repainting.

Source/core/rendering/compositing/RenderLayerCompositor.cpp

Index: Source/core/rendering/compositing/RenderLayerCompositor.cpp
diff --git a/Source/core/rendering/compositing/RenderLayerCompositor.cpp b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
index 457f3d7efbe2bc3e9119280202cf672440a9140c..48ef8a6f01cfa7a237cfcdd4cd13a7c0492c719b 100644
--- a/Source/core/rendering/compositing/RenderLayerCompositor.cpp
+++ b/Source/core/rendering/compositing/RenderLayerCompositor.cpp
@@ -669,8 +669,12 @@ void RenderLayerCompositor::repaintCompositedLayers()
 void RenderLayerCompositor::recursiveRepaintLayer(RenderLayer* layer)
 {
     // FIXME: This method does not work correctly with transforms.
-    if (layer->compositingState() == PaintsIntoOwnBacking)
-        layer->repainter().setBackingNeedsRepaint();
+    if (layer->compositingState() == PaintsIntoOwnBacking) {
+        layer->compositedLayerMapping()->setContentsNeedDisplay();
+        // This function is called only when it is desired to repaint the entire compositing graphics layer tree.
+        // This includes squashing.
+        layer->compositedLayerMapping()->setSquashingContentsNeedDisplay();
+    }
 
 #if ASSERT_ENABLED
     LayerListMutationDetector mutationChecker(layer->stackingNode());