Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/svg/SVGResourceClient.cpp

Index: third_party/WebKit/Source/core/svg/SVGResourceClient.cpp
diff --git a/third_party/WebKit/Source/core/svg/SVGResourceClient.cpp b/third_party/WebKit/Source/core/svg/SVGResourceClient.cpp
deleted file mode 100644
index 4a580f31146f99c117ccf598bdac8885705c2f0c..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/svg/SVGResourceClient.cpp
+++ /dev/null
@@ -1,86 +0,0 @@
-// Copyright 2016 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.
-
-#include "core/svg/SVGResourceClient.h"
-
-#include "core/fetch/DocumentResourceReference.h"
-#include "core/layout/svg/LayoutSVGResourceContainer.h"
-#include "core/layout/svg/ReferenceFilterBuilder.h"
-#include "core/svg/SVGFilterElement.h"
-
-namespace blink {
-
-SVGResourceClient::SVGResourceClient() {
-  ThreadState::current()->registerPreFinalizer(this);
-}
-
-SVGResourceClient::~SVGResourceClient() {}
-
-void SVGResourceClient::addFilterReferences(const FilterOperations& operations,
-                                            const Document& document) {
-  for (size_t i = 0; i < operations.size(); ++i) {
-    FilterOperation* filterOperation = operations.operations().at(i);
-    if (filterOperation->type() != FilterOperation::REFERENCE)
-      continue;
-    ReferenceFilterOperation* referenceFilterOperation =
-        toReferenceFilterOperation(filterOperation);
-    DocumentResourceReference* documentReference =
-        ReferenceFilterBuilder::documentResourceReference(
-            referenceFilterOperation);
-    DocumentResource* cachedSVGDocument =
-        documentReference ? documentReference->document() : 0;
-
-    if (cachedSVGDocument) {
-      cachedSVGDocument->addClient(this);
-      m_externalFilterReferences.append(cachedSVGDocument);
-    } else {
-      Element* element =
-          document.getElementById(referenceFilterOperation->fragment());
-      if (!isSVGFilterElement(element))
-        continue;
-      SVGFilterElement* filter = toSVGFilterElement(element);
-      if (filter->layoutObject())
-        toLayoutSVGResourceContainer(filter->layoutObject())
-            ->addResourceClient(this);
-      else
-        filter->addClient(this);
-      m_internalFilterReferences.add(filter);
-    }
-  }
-}
-
-void SVGResourceClient::clearFilterReferences() {
-  for (SVGFilterElement* filter : m_internalFilterReferences) {
-    if (filter->layoutObject())
-      toLayoutSVGResourceContainer(filter->layoutObject())
-          ->removeResourceClient(this);
-    else
-      filter->removeClient(this);
-  }
-  m_internalFilterReferences.clear();
-
-  for (DocumentResource* documentResource : m_externalFilterReferences)
-    documentResource->removeClient(this);
-  m_externalFilterReferences.clear();
-}
-
-void SVGResourceClient::filterWillBeDestroyed(SVGFilterElement* filter) {
-  m_internalFilterReferences.remove(filter);
-  // TODO(Oilpan): Currently filterNeedsInvalidation() is not called when
-  // the filter is removed from m_internalFilterReferences by weak processing.
-  // It needs to be called.
-  filterNeedsInvalidation();
-}
-
-void SVGResourceClient::notifyFinished(Resource*) {
-  filterNeedsInvalidation();
-}
-
-DEFINE_TRACE(SVGResourceClient) {
-  visitor->trace(m_internalFilterReferences);
-  visitor->trace(m_externalFilterReferences);
-  DocumentResourceClient::trace(visitor);
-}
-
-}  // namespace blink