Workaround rect-based paint invalidation on ancestor clip change

third_party/WebKit/Source/core/layout/LayoutObject.h

Index: third_party/WebKit/Source/core/layout/LayoutObject.h
diff --git a/third_party/WebKit/Source/core/layout/LayoutObject.h b/third_party/WebKit/Source/core/layout/LayoutObject.h
index 910a91bd7a0a8803d30dff77eb1515b55988ac05..f89eef4625b1e665436eb849783e63bd01546a1f 100644
--- a/third_party/WebKit/Source/core/layout/LayoutObject.h
+++ b/third_party/WebKit/Source/core/layout/LayoutObject.h
@@ -1187,7 +1187,9 @@ public:
         // Should check for paint invalidation if some ancestor changed location, because this object
         // may also change paint offset or location in paint invalidation container, even if there is
         // no paint invalidation flag set.
-        return paintInvalidationState.forcedSubtreeInvalidationWithinContainer() || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
+        return paintInvalidationState.forcedSubtreeInvalidationWithinContainer()
+            || paintInvalidationState.forcedSubtreeInvalidationRectUpdateWithinContainer()
+            || shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState();
     }
 
     bool shouldCheckForPaintInvalidationRegardlessOfPaintInvalidationState() const
@@ -1365,11 +1367,11 @@ protected:
     bool containsInlineWithOutlineAndContinuation() const { return m_bitfields.containsInlineWithOutlineAndContinuation(); }
     void setContainsInlineWithOutlineAndContinuation(bool b) { m_bitfields.setContainsInlineWithOutlineAndContinuation(b); }
 
+    const LayoutRect& previousPaintInvalidationRect() const { return m_previousPaintInvalidationRect; }
+
 private:
     void fullyInvalidatePaint(const LayoutBoxModelObject& paintInvalidationContainer, PaintInvalidationReason, const LayoutRect& oldBounds, const LayoutRect& newBounds);
 
-    const LayoutRect& previousPaintInvalidationRect() const { return m_previousPaintInvalidationRect; }
-
     // Adjusts a paint invalidation rect in the space of |m_previousPaintInvalidationRect| and |m_previousPositionFromPaintInvalidationBacking|
     // to be in the space of the |paintInvalidationContainer|,
     // if needed. They can be different only if |paintInvalidationContainer| is a composited scroller.