Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/modules/canvas2d/CanvasRenderingContext2D.h

 /*
  * Copyright (C) 2006, 2007, 2009, 2010, 2011, 2012 Apple Inc. All rights
  * reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 13 matching lines @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef CanvasRenderingContext2D_h
 #define CanvasRenderingContext2D_h
 
 #include "bindings/core/v8/ScriptWrappable.h"
 #include "core/html/canvas/CanvasContextCreationAttributes.h"
 #include "core/html/canvas/CanvasRenderingContext.h"
 #include "core/html/canvas/CanvasRenderingContextFactory.h"
+#include "core/style/FilterOperations.h"
 #include "core/svg/SVGResourceClient.h"
 #include "modules/ModulesExport.h"
 #include "modules/canvas2d/BaseRenderingContext2D.h"
 #include "modules/canvas2d/Canvas2DContextAttributes.h"
 #include "modules/canvas2d/CanvasRenderingContext2DState.h"
 #include "platform/graphics/GraphicsTypes.h"
 #include "platform/heap/GarbageCollected.h"
 #include "public/platform/WebThread.h"
 #include "wtf/Vector.h"
 #include "wtf/text/WTFString.h"
@@ skipping 100 matching lines @@
   void didProcessTask() override;
   void willProcessTask() override {}
 
   void styleDidChange(const ComputedStyle* oldStyle,
                       const ComputedStyle& newStyle) override;
   HitTestCanvasResult* getControlAndIdIfHitRegionExists(
       const LayoutPoint& location) override;
   String getIdFromControl(const Element*) override;
 
   // SVGResourceClient implementation
-  void filterNeedsInvalidation() override;
+  TreeScope* treeScope() override;
+  void resourceContentChanged() override;
+  void resourceElementChanged() override;
+
+  void updateFilterReferences(const FilterOperations&);
+  void clearFilterReferences();
 
   // BaseRenderingContext2D implementation
   bool originClean() const final;
   void setOriginTainted() final;
   bool wouldTaintOrigin(CanvasImageSource* source, ExecutionContext*) final {
     return CanvasRenderingContext::wouldTaintOrigin(source);
   }
 
   int width() const final;
   int height() const final;
@@ skipping 75 matching lines @@
   WebLayer* platformLayer() const override;
 
   Member<HitRegionManager> m_hitRegionManager;
   LostContextMode m_contextLostMode;
   bool m_contextRestorable;
   unsigned m_tryRestoreContextAttemptCount;
   Timer<CanvasRenderingContext2D> m_dispatchContextLostEventTimer;
   Timer<CanvasRenderingContext2D> m_dispatchContextRestoredEventTimer;
   Timer<CanvasRenderingContext2D> m_tryRestoreContextEventTimer;
 
+  FilterOperations m_filterOperations;
   HashMap<String, Font> m_fontsResolvedUsingCurrentStyle;
   bool m_pruneLocalFontCacheScheduled;
   ListHashSet<String> m_fontLRUList;
 };
 
 DEFINE_TYPE_CASTS(CanvasRenderingContext2D,
                   CanvasRenderingContext,
                   context,
                   context->is2d() && context->canvas(),
                   context.is2d() && context.canvas());
 
 }  // namespace blink
 
 #endif  // CanvasRenderingContext2D_h