Unified invalidation for repaint-only style change of layers

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 40929ef10c881f0eb92eec07e8ed59e727051ba5..114c092fecf4580fd83276933358b7eefbdb1ef8 100644
--- a/Source/core/rendering/RenderLayer.cpp
+++ b/Source/core/rendering/RenderLayer.cpp
@@ -3739,6 +3739,19 @@ void RenderLayer::computeSelfHitTestRects(LayerHitTestRects& rects) const
     }
 }
 
+void RenderLayer::setShouldDoFullPaintInvalidationIncludingNonCompositingDescendants()
+{
+    renderer()->setShouldDoFullPaintInvalidation(true);
+
+    // Disable for reading compositingState() in isPaintInvalidationContainer() below.
+    DisableCompositingQueryAsserts disabler;
+
+    for (RenderLayer* child = firstChild(); child; child = child->nextSibling()) {
+        if (!child->isPaintInvalidationContainer())
+            child->setShouldDoFullPaintInvalidationIncludingNonCompositingDescendants();
+    }
+}
+
 DisableCompositingQueryAsserts::DisableCompositingQueryAsserts()
     : m_disabler(gCompositingQueryMode, CompositingQueriesAreAllowed) { }