Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/paint/PaintLayerFilterInfo.cpp

Index: third_party/WebKit/Source/core/paint/PaintLayerFilterInfo.cpp
diff --git a/third_party/WebKit/Source/core/paint/PaintLayerFilterInfo.cpp b/third_party/WebKit/Source/core/paint/PaintLayerFilterInfo.cpp
index b2334a401e695d71a91f10ede4e37182aba8bdd4..d34a1825a7f7ea06a842c17ba4bf820070e4d4e3 100644
--- a/third_party/WebKit/Source/core/paint/PaintLayerFilterInfo.cpp
+++ b/third_party/WebKit/Source/core/paint/PaintLayerFilterInfo.cpp
@@ -30,7 +30,6 @@
 #include "core/paint/PaintLayerFilterInfo.h"
 
 #include "core/paint/PaintLayer.h"
-#include "core/style/FilterOperations.h"
 #include "platform/graphics/filters/FilterEffect.h"
 
 namespace blink {
@@ -42,19 +41,34 @@ PaintLayerFilterInfo::~PaintLayerFilterInfo() {
   DCHECK(!m_layer);
 }
 
+TreeScope* PaintLayerFilterInfo::treeScope() {
+  DCHECK(m_layer);
+  Node* node = m_layer->layoutObject()->node();
+  return node ? &node->treeScope() : nullptr;
+}
+
+void PaintLayerFilterInfo::resourceContentChanged() {
+  DCHECK(m_layer);
+  m_layer->layoutObject()->setShouldDoFullPaintInvalidation();
+  invalidateFilterChain();
+}
+
+void PaintLayerFilterInfo::resourceElementChanged() {
+  DCHECK(m_layer);
+  m_layer->layoutObject()->setShouldDoFullPaintInvalidation();
+  invalidateFilterChain();
+}
+
 void PaintLayerFilterInfo::setLastEffect(FilterEffect* lastEffect) {
   m_lastEffect = lastEffect;
 }
 
-void PaintLayerFilterInfo::updateReferenceFilterClients(
-    const FilterOperations& operations) {
-  clearFilterReferences();
-  addFilterReferences(operations, m_layer->layoutObject()->document());
+FilterEffect* PaintLayerFilterInfo::lastEffect() const {
+  return m_lastEffect;
 }
 
-void PaintLayerFilterInfo::filterNeedsInvalidation() {
-  if (m_layer)
-    m_layer->filterNeedsPaintInvalidation();
+void PaintLayerFilterInfo::invalidateFilterChain() {
+  m_lastEffect = nullptr;
 }
 
 DEFINE_TRACE(PaintLayerFilterInfo) {