Use new downcast helper for blink::SVGFilterElement

This CL has two goals,
  1. Use To<SVGFilterElement> and DynamicTo<SVGFilterElement> as new
   downcast helper
  2. Use IsA<SVGFilterElement>(element) in place of
   IsSVGFilterElement(element)

Bug: 891908
Change-Id: I3504c8bfd82dc6938ac53f8bd6169fa0be338592
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1936584Reviewed-by: Kentaro Hara <haraken@chromium.org>
Commit-Queue: Abhijeet | Igalia <abhijeet@igalia.com>
Cr-Commit-Position: refs/heads/master@{#720396}

third_party/blink/renderer/core/layout/svg/layout_svg_resource_filter.cc

@@ -87,20 +87,20 @@ bool LayoutSVGResourceFilter::RemoveClientFromCache(SVGResourceClient& client) {
 
 FloatRect LayoutSVGResourceFilter::ResourceBoundingBox(
     const FloatRect& reference_box) const {
-  const auto* filter_element = ToSVGFilterElement(GetElement());
+  const auto* filter_element = To<SVGFilterElement>(GetElement());
   return SVGLengthContext::ResolveRectangle(filter_element, FilterUnits(),
                                             reference_box);
 }
 
 SVGUnitTypes::SVGUnitType LayoutSVGResourceFilter::FilterUnits() const {
-  return ToSVGFilterElement(GetElement())
+  return To<SVGFilterElement>(GetElement())
       ->filterUnits()
       ->CurrentValue()
       ->EnumValue();
 }
 
 SVGUnitTypes::SVGUnitType LayoutSVGResourceFilter::PrimitiveUnits() const {
-  return ToSVGFilterElement(GetElement())
+  return To<SVGFilterElement>(GetElement())
       ->primitiveUnits()
       ->CurrentValue()
       ->EnumValue();
@@ -126,8 +126,8 @@ void LayoutSVGResourceFilter::PrimitiveAttributeChanged(
       return;
     node_map->InvalidateDependentEffects(effect);
   }
-  if (LocalSVGResource* resource =
-          ToSVGFilterElement(GetElement())->AssociatedResource()) {
+  if (auto* resource =
+          To<SVGFilterElement>(GetElement())->AssociatedResource()) {
     resource->NotifyContentChanged(
         SVGResourceClient::kPaintInvalidation |
         SVGResourceClient::kSkipAncestorInvalidation);

third_party/blink/renderer/core/layout/svg/svg_layout_tree_as_text.cc

@@ -567,8 +567,8 @@ void WriteSVGResourceContainer(WTF::TextStream& ts,
     auto* dummy_filter = MakeGarbageCollected<Filter>(dummy_rect, dummy_rect, 1,
                                                       Filter::kBoundingBox);
     SVGFilterBuilder builder(dummy_filter->GetSourceGraphic());
-    builder.BuildGraph(dummy_filter, ToSVGFilterElement(*filter->GetElement()),
-                       dummy_rect);
+    builder.BuildGraph(dummy_filter,
+                       To<SVGFilterElement>(*filter->GetElement()), dummy_rect);
     if (FilterEffect* last_effect = builder.LastEffect())
       last_effect->ExternalRepresentation(ts, indent + 1);
   } else if (resource->ResourceType() == kClipperResourceType) {

third_party/blink/renderer/core/paint/filter_effect_builder.cc

@@ -415,7 +415,7 @@ Filter* FilterEffectBuilder::BuildReferenceFilter(
     FilterEffect* previous_effect) const {
   SVGResource* resource = reference_operation.Resource();
   if (auto* filter =
-          ToSVGFilterElementOrNull(resource ? resource->Target() : nullptr))
+          DynamicTo<SVGFilterElement>(resource ? resource->Target() : nullptr))
     return BuildReferenceFilter(*filter, previous_effect);
   return nullptr;
 }

third_party/blink/renderer/core/paint/svg_filter_painter.cc

@@ -101,7 +101,7 @@ GraphicsContext* SVGFilterPainter::PrepareEffect(
   auto* node_map = MakeGarbageCollected<SVGFilterGraphNodeMap>();
   FilterEffectBuilder builder(object.ObjectBoundingBox(), 1);
   Filter* filter = builder.BuildReferenceFilter(
-      ToSVGFilterElement(*filter_.GetElement()), nullptr, node_map);
+      To<SVGFilterElement>(*filter_.GetElement()), nullptr, node_map);
   if (!filter || !filter->LastEffect())
     return nullptr;
 

third_party/blink/renderer/core/svg/svg_fe_image_element.cc

@@ -143,7 +143,7 @@ void SVGFEImageElement::ImageNotifyFinished(ImageResourceContent*) {
     return;
 
   Element* parent = parentElement();
-  if (!parent || !IsSVGFilterElement(parent) || !parent->GetLayoutObject())
+  if (!parent || !IsA<SVGFilterElement>(parent) || !parent->GetLayoutObject())
     return;
 
   if (LayoutObject* layout_object = GetLayoutObject())

third_party/blink/renderer/core/svg/svg_filter_primitive_standard_attributes.cc

@@ -172,20 +172,20 @@ LayoutObject* SVGFilterPrimitiveStandardAttributes::CreateLayoutObject(
 
 bool SVGFilterPrimitiveStandardAttributes::LayoutObjectIsNeeded(
     const ComputedStyle& style) const {
-  if (IsSVGFilterElement(parentNode()))
+  if (IsA<SVGFilterElement>(parentNode()))
     return SVGElement::LayoutObjectIsNeeded(style);
 
   return false;
 }
 
 void SVGFilterPrimitiveStandardAttributes::Invalidate() {
-  if (SVGFilterElement* filter = ToSVGFilterElementOrNull(parentElement()))
+  if (auto* filter = DynamicTo<SVGFilterElement>(parentElement()))
     filter->InvalidateFilterChain();
 }
 
 void SVGFilterPrimitiveStandardAttributes::PrimitiveAttributeChanged(
     const QualifiedName& attribute) {
-  if (SVGFilterElement* filter = ToSVGFilterElementOrNull(parentElement()))
+  if (auto* filter = DynamicTo<SVGFilterElement>(parentElement()))
     filter->PrimitiveAttributeChanged(*this, attribute);
 }