Use unified invalidation path for repaint-only style changes

Source/core/rendering/RenderLayerModelObject.cpp

Index: Source/core/rendering/RenderLayerModelObject.cpp
diff --git a/Source/core/rendering/RenderLayerModelObject.cpp b/Source/core/rendering/RenderLayerModelObject.cpp
index 16587ac73d9a3e1ee351f496c70c48d4c96923d5..0820cbd735449fc4f3a6d7574ab106cd31916293 100644
--- a/Source/core/rendering/RenderLayerModelObject.cpp
+++ b/Source/core/rendering/RenderLayerModelObject.cpp
@@ -90,16 +90,14 @@ void RenderLayerModelObject::styleWillChange(StyleDifference diff, const RenderS
 {
     s_wasFloating = isFloating();
 
-    // If our z-index changes value or our visibility changes,
-    // we need to dirty our stacking context's z-order list.
     RenderStyle* oldStyle = style();
     if (oldStyle) {
-        // Do a repaint with the old style first through RenderLayerRepainter.
-        // RenderObject::styleWillChange takes care of repainting objects without RenderLayers.
+        // Mark layer for invalidation with the old style first.
+        // RenderObject::styleWillChange and RenderObject::setStyle take care of
+        // invalidating objects without RenderLayers and invalidating layers with the
+        // new style.
         if (parent() && diff.needsRepaintLayer()) {
-            // This is currently need to make non-layout-requiring updates work that impact descendant layers,
-            // such as changes to opacity or transform.
-            layer()->repainter().repaintIncludingNonCompositingDescendants();
+            layer()->setShouldDoFullPaintInvalidationIncludingNonCompositingDescendants();
             if (oldStyle->hasClip() != newStyle.hasClip()
                 || oldStyle->clip() != newStyle.clip())
                 layer()->clipper().clearClipRectsIncludingDescendants();