Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/layout/svg/ReferenceFilterBuilder.cpp

Index: third_party/WebKit/Source/core/layout/svg/ReferenceFilterBuilder.cpp
diff --git a/third_party/WebKit/Source/core/layout/svg/ReferenceFilterBuilder.cpp b/third_party/WebKit/Source/core/layout/svg/ReferenceFilterBuilder.cpp
deleted file mode 100644
index b0a0a0a24ba7cddcf805277b53f3488a2db930b1..0000000000000000000000000000000000000000
--- a/third_party/WebKit/Source/core/layout/svg/ReferenceFilterBuilder.cpp
+++ /dev/null
@@ -1,95 +0,0 @@
-/*
- * Copyright (C) 2013 Adobe Systems Inc. All rights reserved.
- * Copyright (C) 2013 Google Inc.  All rights reserved.
- * Copyright (C) 2011 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
- *    notice, this list of conditions and the following disclaimer in the
- *    documentation and/or other materials provided with the distribution.
- *
- * THIS SOFTWARE IS PROVIDED BY APPLE INC. ``AS IS'' AND ANY
- * EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
- * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
- * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL APPLE COMPUTER, INC. OR
- * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
- * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- */
-
-#include "core/layout/svg/ReferenceFilterBuilder.h"
-
-#include "core/dom/Element.h"
-#include "core/fetch/DocumentResource.h"
-#include "core/style/FilterOperation.h"
-#include "core/svg/SVGDocumentExtensions.h"
-#include "core/svg/SVGFilterElement.h"
-
-namespace blink {
-
-namespace {
-
-using ResourceReferenceMap =
-    PersistentHeapHashMap<WeakMember<const FilterOperation>,
-                          Member<DocumentResourceReference>>;
-
-ResourceReferenceMap& documentResourceReferences() {
-  DEFINE_STATIC_LOCAL(ResourceReferenceMap, documentResourceReferences, ());
-  return documentResourceReferences;
-}
-
-}  // namespace
-
-DocumentResourceReference* ReferenceFilterBuilder::documentResourceReference(
-    const FilterOperation* filterOperation) {
-  return documentResourceReferences().get(filterOperation);
-}
-
-void ReferenceFilterBuilder::setDocumentResourceReference(
-    const FilterOperation* filterOperation,
-    DocumentResourceReference* documentResourceReference) {
-  ASSERT(!documentResourceReferences().contains(filterOperation));
-  documentResourceReferences().add(filterOperation, documentResourceReference);
-}
-
-SVGFilterElement* ReferenceFilterBuilder::resolveFilterReference(
-    const ReferenceFilterOperation& filterOperation,
-    Element& element) {
-  TreeScope* treeScope = &element.treeScope();
-
-  if (DocumentResourceReference* documentResourceRef =
-          documentResourceReference(&filterOperation)) {
-    // If we have an SVG document, this is an external reference. Otherwise
-    // we look up the referenced node in the current document.
-    if (DocumentResource* cachedSVGDocument = documentResourceRef->document())
-      treeScope = cachedSVGDocument->document();
-  }
-
-  if (!treeScope)
-    return nullptr;
-
-  Element* filter = treeScope->getElementById(filterOperation.fragment());
-
-  if (!filter) {
-    // Although we did not find the referenced filter, it might exist later
-    // in the document.
-    treeScope->document().accessSVGExtensions().addPendingResource(
-        filterOperation.fragment(), &element);
-    return nullptr;
-  }
-
-  if (!isSVGFilterElement(*filter))
-    return nullptr;
-
-  return toSVGFilterElement(filter);
-}
-
-}  // namespace blink