Improve handling of PaintInvalidationLayer (renamed to PaintInvalidationSubtree)

third_party/WebKit/Source/core/layout/LayoutBox.cpp

Index: third_party/WebKit/Source/core/layout/LayoutBox.cpp
diff --git a/third_party/WebKit/Source/core/layout/LayoutBox.cpp b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
index a51eff04ecaa61b967a46bbe529ba4078db00523..73e139de46f64193ce9eeb4c30ea34aae028b209 100644
--- a/third_party/WebKit/Source/core/layout/LayoutBox.cpp
+++ b/third_party/WebKit/Source/core/layout/LayoutBox.cpp
@@ -3850,10 +3850,10 @@ bool LayoutBox::hasNonCompositedScrollbars() const
     return false;
 }
 
-PaintInvalidationReason LayoutBox::getPaintInvalidationReason(const LayoutBoxModelObject& paintInvalidationContainer,
+PaintInvalidationReason LayoutBox::getPaintInvalidationReason(const PaintInvalidationState& paintInvalidationState,
     const LayoutRect& oldBounds, const LayoutPoint& oldLocation, const LayoutRect& newBounds, const LayoutPoint& newLocation) const
 {
-    PaintInvalidationReason invalidationReason = LayoutBoxModelObject::getPaintInvalidationReason(paintInvalidationContainer, oldBounds, oldLocation, newBounds, newLocation);
+    PaintInvalidationReason invalidationReason = LayoutBoxModelObject::getPaintInvalidationReason(paintInvalidationState, oldBounds, oldLocation, newBounds, newLocation);
     if (isFullPaintInvalidationReason(invalidationReason))
         return invalidationReason;
 
@@ -3872,7 +3872,7 @@ PaintInvalidationReason LayoutBox::getPaintInvalidationReason(const LayoutBoxMod
     // because the difference between oldBounds and newBounds doesn't cover all area needing invalidation.
     // FIXME: Should also consider ancestor transforms since paintInvalidationContainer. crbug.com/426111.
     if (invalidationReason == PaintInvalidationIncremental
-        && paintInvalidationContainer != this
+        && paintInvalidationState.paintInvalidationContainer() != this
         && hasLayer() && layer()->transform() && !layer()->transform()->isIdentityOrTranslation())
         return PaintInvalidationBoundsChange;