Fix paint property under-invalidation checking about reference filters

third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.h

Index: third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.h
diff --git a/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.h b/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.h
index fd8a894eb5bf7b1a6ec84be761ac2fe1282a621f..55201806f78f625a0db57867329ae9e0d7880d9f 100644
--- a/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.h
+++ b/third_party/WebKit/Source/platform/graphics/paint/EffectPaintPropertyNode.h
@@ -76,12 +76,13 @@ class PLATFORM_EXPORT EffectPaintPropertyNode
   }
 
   // The equality operator is used by FindPropertiesNeedingUpdate.h for checking
-  // if an effect node has changed.
+  // if an effect node has changed. It ignores changes of reference filters
+  // because SkImageFilter doesn't have an equality operator.
   bool operator==(const EffectPaintPropertyNode& o) const {
     return m_parent == o.m_parent &&
            m_localTransformSpace == o.m_localTransformSpace &&
-           m_outputClip == o.m_outputClip && m_filter == o.m_filter &&
-           m_opacity == o.m_opacity;
+           m_outputClip == o.m_outputClip && m_opacity == o.m_opacity &&
+           m_filter.equalsIgnoringReferenceFilters(o.m_filter);
   }
 #endif