Proactively dispose image filters for SVG filter chains

third_party/WebKit/Source/platform/graphics/filters/FilterEffect.cpp

 /*
  * Copyright (C) 2008 Alex Mathews <possessedpenguinbob@gmail.com>
  * Copyright (C) 2009 Dirk Schulze <krit@webkit.org>
  * Copyright (C) Research In Motion Limited 2010. All rights reserved.
  * Copyright (C) 2012 University of Szeged
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
@@ skipping 70 matching lines @@
   FloatRect result = MapInputs(rect);
   result = MapEffect(result);
   return ApplyBounds(result);
 }
 
 FilterEffect* FilterEffect::InputEffect(unsigned number) const {
   SECURITY_DCHECK(number < input_effects_.size());
   return input_effects_.at(number).Get();
 }
 
-void FilterEffect::ClearResult() {
+void FilterEffect::DisposeImageFilters() {
   for (int i = 0; i < 4; i++)
     image_filters_[i] = nullptr;
 }
 
+void FilterEffect::DisposeImageFiltersRecursive() {
+  if (!HasImageFilter())
+    return;
+  DisposeImageFilters();
+  for (auto& effect : input_effects_)
+    effect->DisposeImageFiltersRecursive();
+}
+
 Color FilterEffect::AdaptColorToOperatingColorSpace(const Color& device_color) {
   // |deviceColor| is assumed to be DeviceRGB.
   return ColorSpaceUtilities::ConvertColor(device_color, OperatingColorSpace());
 }
 
 TextStream& FilterEffect::ExternalRepresentation(TextStream& ts, int) const {
   // FIXME: We should dump the subRegions of the filter primitives here later.
   // This isn't possible at the moment, because we need more detailed
   // information from the target object.
   return ts;
@@ skipping 52 matching lines @@
 }
 
 void FilterEffect::SetImageFilter(ColorSpace color_space,
                                   bool requires_pm_color_validation,
                                   sk_sp<SkImageFilter> image_filter) {
   int index = GetImageFilterIndex(color_space, requires_pm_color_validation);
   image_filters_[index] = std::move(image_filter);
 }
 
 }  // namespace blink