Reland of "Tracking reference filter mutation via SVGElementProxy"

third_party/WebKit/Source/core/style/FilterOperations.cpp

 /*
  * 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 COMPUTER, 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/style/FilterOperations.h"
 
-#include "platform/LengthFunctions.h"
-#include "platform/geometry/IntSize.h"
-#include "platform/graphics/filters/FEGaussianBlur.h"
 #include <numeric>
 
 namespace blink {
 
 FilterOperations::FilterOperations() {}
 
 DEFINE_TRACE(FilterOperations) {
   visitor->trace(m_operations);
 }
 
@@ skipping 60 matching lines @@
 }
 
 bool FilterOperations::hasFilterThatMovesPixels() const {
   for (size_t i = 0; i < m_operations.size(); ++i) {
     if (m_operations[i]->movesPixels())
       return true;
   }
   return false;
 }
 
+void FilterOperations::addClient(SVGResourceClient* client) const {
+  for (FilterOperation* operation : m_operations) {
+    if (operation->type() == FilterOperation::REFERENCE)
+      toReferenceFilterOperation(*operation).addClient(client);
+  }
+}
+
+void FilterOperations::removeClient(SVGResourceClient* client) const {
+  for (FilterOperation* operation : m_operations) {
+    if (operation->type() == FilterOperation::REFERENCE)
+      toReferenceFilterOperation(*operation).removeClient(client);
+  }
+}
+
 }  // namespace blink