Fix paint property under-invalidation checking about reference filters

third_party/WebKit/Source/core/paint/ObjectPaintProperties.h

Index: third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
diff --git a/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h b/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
index ba7540160dcd65a9785e7d4eb5b2c6af630dbf29..1faf65c34f5f33dc66dcd9d6a15645a0ffeffe7a 100644
--- a/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
+++ b/third_party/WebKit/Source/core/paint/ObjectPaintProperties.h
@@ -18,6 +18,10 @@
 #include "wtf/RefPtr.h"
 #include <memory>
 
+#if DCHECK_IS_ON()
+#include "core/style/FilterOperations.h"
+#endif
+
 namespace blink {
 
 // This class stores property tree related information associated with a
@@ -283,8 +287,20 @@ class CORE_EXPORT ObjectPaintProperties {
               PropertyTreeState(state.transform(), state.clip(), state.effect(),
                                 state.scroll())));
     }
+    cloned->setStyleFilterOperations(m_styleFilterOperations);
     return cloned;
   }
+
+  // Used to check changes of filters, especially reference filters which are
+  // ignored in EffectPaintPropertyNode::operator==() because we have no way to
+  // check equality of SkImageFilter values.
+  const FilterOperations& styleFilterOperations() const {
+    return m_styleFilterOperations;
+  }
+  void setStyleFilterOperations(const FilterOperations& operations) {
+    m_styleFilterOperations = operations;
+  }
+  DEFINE_INLINE_TRACE() { visitor->trace(m_styleFilterOperations); }
 #endif
 
  private:
@@ -326,6 +342,10 @@ class CORE_EXPORT ObjectPaintProperties {
   RefPtr<ScrollPaintPropertyNode> m_scroll;
 
   std::unique_ptr<PropertyTreeStateWithOffset> m_localBorderBoxProperties;
+
+#if DCHECK_IS_ON()
+  FilterOperations m_styleFilterOperations;
+#endif
 };
 
 }  // namespace blink