Fix paint property under-invalidation checking about reference filters

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

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #ifndef EffectPaintPropertyNode_h
 #define EffectPaintPropertyNode_h
 
 #include "cc/layers/layer.h"
 #include "platform/PlatformExport.h"
 #include "platform/graphics/CompositorFilterOperations.h"
@@ skipping 58 matching lines @@
 
 #if DCHECK_IS_ON()
   // The clone function is used by FindPropertiesNeedingUpdate.h for recording
   // an effect node before it has been updated, to later detect changes.
   PassRefPtr<EffectPaintPropertyNode> clone() const {
     return adoptRef(new EffectPaintPropertyNode(
         m_parent, m_localTransformSpace, m_outputClip, m_filter, m_opacity));
   }
 
   // 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
 
  private:
   EffectPaintPropertyNode(
       PassRefPtr<const EffectPaintPropertyNode> parent,
       PassRefPtr<const TransformPaintPropertyNode> localTransformSpace,
       PassRefPtr<const ClipPaintPropertyNode> outputClip,
       CompositorFilterOperations filter,
       float opacity)
@@ skipping 29 matching lines @@
   mutable scoped_refptr<cc::Layer> m_dummyLayer;
 };
 
 // Redeclared here to avoid ODR issues.
 // See platform/testing/PaintPrinters.h.
 void PrintTo(const EffectPaintPropertyNode&, std::ostream*);
 
 }  // namespace blink
 
 #endif  // EffectPaintPropertyNode_h